Papers

@article{noauthor_stochastic_2025,

title = {Stochastic Nature of Voltage-Controlled Charge Dynamics in AlOx Magnetic Tunnel Junctions},

author = {Chun-Yen Chen, Bao-Huei Huang, Yu-Hui Tang, César Gonzalez-Ruano, Farkhad G. Aliev, Dah-Chin Ling, Jhen-Yong Hong},

url = {https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.5c01332},

doi = {https://pubs.acs.org/doi/10.1021/acs.nanolett.5c01332},

year  = {2025},

date = {2025-07-01},

urldate = {2025-07-01},

journal = {Nano Letters},

abstract = {Spintronic memristors based on ferromagnetic metal/oxide heterostructures have recently enabled reversible manipulation of both magnetic properties and resistive switching (RS), offering promising prospects for multibit memory and neuromorphic computing. In this study, we investigate the stochastic nature and relaxation processes of charge dynamics induced by localized oxygen vacancy (VO) in AlOx-based magnetic tunnel junctions (MTJs). We observe that random telegraph noise (RTN) exhibits charge stochasticity at specific bias voltages in the low resistance state (LRS), reflecting the competition and transition between charge capture and emission states against the thermal energy. This behavior reveals that the thermally unstable charge stochasticity originates from localized traps in the AlOx barrier. In contrast, the high resistance state (HRS) favors the RTN emission states, indicating the dominance of direct tunneling effects. Through numerical calculations based on the tight-binding (TB) model and experimental results, we demonstrate that voltage-driven shifts in the VO position within the AlOx barrier, associated with RS, govern the charge dynamics of the MTJs investigated. These findings provide valuable insights and practical implications for the development of next-generation devices leveraging charge stochasticity in AlOx-based MTJs.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{cano_microscopic_2025,

title = {Microscopic Insights into Magnetic Warping and Time-Reversal Symmetry Breaking in Topological Surface States of Rare-Earth-Doped Bi2Te3},

author = {Beatriz Muñiz Cano and Fabián Calleja and Ji Dai and Massimo Tallarida and Vera Marinova and Alessandro Barla and Marc G. Cuxart and Pierluigi Gargiani and Gonzalo N. Molina and José Angel Silva-Guillén and Adriana I. Figueroa and Kevin García-Díez and Sergio O. Valenzuela and Aitor Mugarza and Amadeo L. Vázquez Parga and Rodolfo Miranda and Francisco Guinea and Manuela Garnica and Miguel A. Valbuena},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202510877},

doi = {10.1002/adma.202510877},

issn = {1521-4095},

year  = {2025},

date = {2025-01-01},

urldate = {2026-03-31},

journal = {Advanced Materials},

volume = {n/a},

number = {n/a},

pages = {e10877},

abstract = {Magnetic interactions at the surface of topological insulators provide a versatile route to engineer exotic quantum states. Breaking time-reversal symmetry (TRS) at the topological surface state (TSS) enables the opening of a Dirac gap, which is essential for realizing quantum anomalous Hall physics. This work investigates the impact of submonolayer deposition of magnetic rare-earth adatoms on the prototypical topological insulator Bi2Te3. Scanning tunneling microscopy (STM) supported by first-principle calculations, core-level photoemission spectroscopy (XPS), angle-resolved photoemission spectroscopy (ARPES), X-ray magnetic circular dichroism (XMCD) and quasiparticle interference (QPI) mapping are combined to reveal direct evidence of local interactions between erbium (Er) atoms and the substrate, leading to significant modifications of the TSS. XMCD measurements confirm the out-of-plane magnetic anisotropy for Er adatoms on Bi2Te3 , which induces a warping transition of the Fermi surface from a snowflake to a star-of-David-like geometry, along with a Dirac point gap opening and spectral splitting near the Γ point. QPI maps confirm the reconstructed surface band topology through modified scattering patterns consistent with TRS breaking. Our results identify a microscopic mechanism for magnetic interaction at the surface of a topological insulator and establish magnetic rare-earth doping as an effective strategy to tailor topological electronic states with atomic-scale control.},

note = {_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/adma.202510877},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{diaz-sanchez_charge_2025,

title = {Charge Compensation Mechanisms in Ni-Rich NMC Cathodes},

author = {Jesus Díaz-Sánchez and Ingeborg S. Ellingsen and Elena Salagre and Jesús Sánchez-Prieto and Noelia Maldonado and Arturo Galindo and Carmen Morant and Enrique Vasco and Gastón Garcia and Daniel Rettenwander and Juan Rubio-Zuazo and Enrique G. Michel and Celia Polop},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/batt.202500167},

doi = {10.1002/batt.202500167},

issn = {2566-6223},

year  = {2025},

date = {2025-01-01},

urldate = {2026-03-31},

journal = {Batteries & Supercaps},

volume = {8},

number = {12},

pages = {e202500167},

abstract = {Understanding charge compensation mechanisms in nickel-rich lithium nickel–manganese–cobalt alloy oxide (NMC) cathodes is crucial for optimizing their electrochemical performance. This study employs complementary spectroscopic techniques with varying probing depths, including X-ray absorption near-edge structure spectroscopy, hard X-ray photoemission spectroscopy, X-ray photoelectron spectroscopy, and ion beam analysis, to investigate the correlation between transition metal oxidation states and Li depth profile in NMC811. This approach reveals different charge compensation mechanisms depending on the local Li content, which exhibits near-surface gradients. The results show that Ni oxidation is the main charge compensation mechanism for moderate delithiations at a Li stoichiometry x > 0.35. When the Li content drops below the threshold x = 0.3, which occurs near the surface for high state of charge (SOC), compensation by Ni/Li mixing prevails. Meanwhile, the Li-depleted surface (with x ≪ 0.3) shows evidence of transformation into electrochemically inactive Li-free cubic phases. The voltage window used to cycle the NMC811 prevents the bulk Li content from falling below x = 0.35, so the different charge compensation mechanisms coexist for high SOCs, allowing to compare between their kinetics. This study contributes to a comprehensive understanding of the electrochemical behavior of nickel-rich NMCs, aiding the development of high-energy Li-ion batteries with improved stability.},

note = {_eprint: https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/batt.202500167},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{camarero_light-induced_2025,

title = {Light-Induced Accumulation of Micro- and Nanoplastics from Water Dispersion by Optoelectronic Lithium Niobate Platforms},

author = {Pablo Camarero and Esther Rincón and Patricia Haro-González and Fernando Agulló-Rueda and Angel García-Cabañes and Mercedes Carrascosa},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/admi.202500462},

doi = {10.1002/admi.202500462},

issn = {2196-7350},

year  = {2025},

date = {2025-01-01},

urldate = {2026-03-31},

journal = {Advanced Materials Interfaces},

volume = {12},

number = {21},

pages = {e00462},

abstract = {Plastic contamination in marine and drinking water is a major concern in environmental research. Particularly, detection and identification of micro and nanometric particles remain as important challenges, and so, several emergent methods are currently being investigated. Here, an optoelectronic platform is presented for trapping and accumulating micro/nano-plastics dispersed in water. The system exploits the photo-induced electric fields generated by visible light in LiNbO3:Fe crystals. When light is focused on the crystal, the photogenerated electric field triggers successive ejection of tiny droplets from the aqueous sample. These droplets reach the illuminated surface and evaporate leaving behind accumulated particles. Efficient accumulation of polystyrene microparticles is achieved down to 1 µg L−1. The influence of plastic concentration and illumination time are characterized. Moreover, the method is further validated at the nanoscale using 140 nm diameter polystyrene (PS) nanoparticles. Its functionality in saline water dispersions is also confirmed although exhibiting a lower efficiency. Finally, the platform´s versatility is demonstrated by accumulating other plastic contaminants such as polyethylene (PE) and polymethyl-methacrylate (PMMA), and a mix of PE and PS. The resulting accumulation spots serve as suitable samples for plastic identification by Raman spectroscopy. Overall, these results highlight the potential of optoelectronic lithium niobate platforms for micro/nano-plastics capture, accumulation and Raman identification.},

note = {_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/admi.202500462},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{lorente-arevalo_ultrahigh-throughput_2025,

title = {Ultrahigh-throughput screening assay for PET-degrading enzymes},

author = {Alvaro Lorente-Arevalo and Maria Gimeno-Perez and Carmen Ortega and James D. Finnigan and Simon B. R. Charnock and Aurelio Hidalgo},

editor = {D. Tischler},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-105003422260&doi=10.1016%2Fbs.mie.2025.01.021&partnerID=40&md5=23b835dd5598cec528d9d2138c5359f1},

doi = {10.1016/bs.mie.2025.01.021},

issn = {00766879},

year  = {2025},

date = {2025-01-01},

journal = {Methods in Enzymology},

volume = {714},

pages = {489 – 503},

publisher = {Academic Press Inc.},

abstract = {In recent years, several PET-degrading enzymes have been identified from both known microorganisms and metagenomic sources in response to the growing environmental issue of polyethylene terephthalate (PET) accumulation. Despite this progress, there is a limited number of (ultra)high-throughput screening methods for assessing PET-hydrolyzing activity without relying on surrogate substrates. This method utilizes the coupled activity of ketoreductases (KREDs) and diaphorase to produce a fluorescent compound (resorufin) in the presence of PET degradation products, offering a more direct and efficient screening approach. A metagenomic KRED was coupled with the diaphorase from Clostridium kluyveri to enable the detection of the hydrolysis of PET degradation products catalyzed by the Bacillus subtilis BS2 esterase. The coupled reaction was established in water-in-oil microdroplets, encapsulating a single E. coli cell per droplet, demonstrating its potential for use in the ultrahigh-throughput screening of metagenomic libraries or randomized libraries for directed evolution campaigns. © 2025},

note = {ISBN: 9780443415739; 9780443431180; 9780443345272; 9780323853743; 9780443131974; 9780128147177; 9780323912228; 9780443185847; 9780124200678; 9780443185960 

Type: Book chapter},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{pulido_drug_2025,

title = {Drug delivery system based on an antibacterial layer-by-layer coating on urinary catheters: an experimental and simulation approach},

author = {Ruth Pulido and Nelson Naveas and F. J. Fernández-Alonso and Miguel Jose Manso and Leonardo Soriano and Carlos Alejandro Torres-Ulloa and Karel Mena-Ulecia and Gonzalo Recio-Sánchez and Juan Paulo García-Sandoval and Jacobo Hernández-Montelongo},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-105015457872&doi=10.3389%2Ffbioe.2025.1614509&partnerID=40&md5=4c03b8eae90e1969da24bacd3e4e7149},

doi = {10.3389/fbioe.2025.1614509},

year  = {2025},

date = {2025-01-01},

journal = {Frontiers in Bioengineering and Biotechnology},

volume = {13},

publisher = {Frontiers Media SA},

abstract = {Urinary catheters (UCs) are critical in biomedical applications, but prolonged use increases the risk of catheter-associated urinary tract infections (CAUTIs), a leading cause of healthcare-associated infections (HAIs). The present study presents a dual strategy to create an antibacterial surface on commercial Foley silicone UCs by combining a contact-killing effect with the controlled release of antimicrobial compounds. We designed a drug delivery system using a layer-by-layer (LbL) antibacterial coating of carboxymethylcellulose (CMC) and chitosan-silver (CHI-Ag) complexes, with ciprofloxacin (CFX) as the model drug. The resulting LbL coating, about 1 (Formula presented.) thick, incorporated (Formula presented.) and demonstrated a high capacity for CFX loading, releasing over twice the amount ((Formula presented.)) compared to uncoated UCs ((Formula presented.)). The antibacterial efficacy was significantly higher in the LbL-coated samples, particularly against S. aureus compared to E. coli. Drug release experiments, modeled using Fick’s second law, indicated a diffusivity of (Formula presented.). Our mathematical model predicts how variations in drug loading and rest times impact release profiles. Finally, molecular dynamics simulations suggested strong compatibility between CFX and the LbL layers, though with relatively low stability. This dual strategy holds promise for reducing CAUTIs effectively. © © 2025 Pulido, Naveas, Fernández-Alonso, Manso-Silván, Soriano, Torres-Ulloa, Mena-Ulecia, Recio-Sánchez, Garcia-Sandoval and Hernández-Montelongo.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{miran_biochemical_2025,

title = {Biochemical properties and functions of pectin and hemicellulose polysaccharides and derived oligosaccharides: impact on human health},

author = {Mona Miran and Sara Gashtasebi and Maryam Salami and Zahra Emam-Diomeh and F. Javier Moreno},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-105019744031&doi=10.1016%2FB978-0-443-22300-6.00033-4&partnerID=40&md5=fc7bd2b30fba688aa65abf9daf470117},

doi = {10.1016/B978-0-443-22300-6.00033-4},

year  = {2025},

date = {2025-01-01},

journal = {Molecular Medicine and Biomedical Research in the Era of Precision Medicine: New Technologies and Personalized Drug Therapies for Patient Care},

pages = {941 – 973},

publisher = {Elsevier},

abstract = {Polysaccharides are complex carbohydrates composed of monosaccharides linked together by glycosidic bonds. Plant-based polysaccharides offer numerous benefits to human health due to their unique structural features, such as chemical structures, varying monosaccharide and chemical composition, glycosidic linkages and molecular weights, which determine their physicochemical properties and contribute to their extensive applications in various biological activities. Lignocellulose, a naturally occurring material in plants, consists of cellulose, hemicellulose and lignin, which together with pectic polysaccharides are widely present in plant cell walls. Hemicellulose polysaccharides extracted from lignocellulosic materials, as well as pectin, have various biological activities and potential applications in the pharmaceutical, biomedical and food industries. Some of the biological activities of hemicellulose polysaccharides, pectin, and their oligosaccharides include prebiotic, antioxidant, anti-inflammatory and immunomodulatory properties, which are reviewed in this chapter. © 2025 Elsevier Inc. All rights reserved.},

note = {ISBN: 9780443223006; 9780443223013 

Type: Book chapter},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{caukwell_lipidic_2025-1,

title = {Lipidic drug delivery systems are responsive to the human microbiome},

author = {Jonathan Caukwell and Salvatore Assenza and Karl A. Hassan and Brett Anthony Neilan and Andrew J. Clulow and Livia Salvati Manni and Wye Khay Fong},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201165361&doi=10.1016%2Fj.jcis.2024.07.216&partnerID=40&md5=d4bafa730392ccf47a56c3f925ad9c3a},

doi = {10.1016/j.jcis.2024.07.216},

issn = {00219797},

year  = {2025},

date = {2025-01-01},

journal = {Journal of Colloid and Interface Science},

volume = {677},

pages = {293 – 302},

abstract = {In vitro and in vivo tests for therapeutic agents are typically conducted in sterile environments, but many target areas for drug delivery are home to thousands of microbial species. Here, we examine the behaviour of lipidic nanomaterials after exposure to representative strains of four bacterial species found in the gastrointestinal tract and skin. Small angle X-ray scattering measurements show that the nanostructure of monoolein cubic and inverse hexagonal phases are transformed, respectively, into inverse hexagonal and inverse micellar cubic phases upon exposure to a strain of live Staphylococcus aureus often present on skin and mucosa. Further investigation demonstrates that enzymatic hydrolysis and cell membrane lipid transfer are both likely responsible for this effect. The structural responses to S. aureus are rapid and significantly reduce the rate of drug release from monoolein-based nanomaterials. These findings are the first to demonstrate how a key species in the live human microbiome can trigger changes in the structure and drug release properties of lipidic nanomaterials. The effect appears to be strain specific, varies from patient to patient and body region to body region, and is anticipated to affect the bioapplication of monoglyceride-based formulations. © 2024 The Author(s)},

note = {Publisher: Academic Press Inc. 

Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ben_saddik_absorption_2025-1,

title = {On the absorption coefficient of GaP1-xNx layers and its potential application for silicon photovoltaics},

author = {Karim Ben Saddik and María Jesús Hernández and María Ángela Pampillón and Manuel Cervera and B. J. García},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85206315773&doi=10.1016%2Fj.mssp.2024.109011&partnerID=40&md5=73e8a1ce92b3374552e5d3cb68708592},

doi = {10.1016/j.mssp.2024.109011},

issn = {13698001},

year  = {2025},

date = {2025-01-01},

journal = {Materials Science in Semiconductor Processing},

volume = {185},

abstract = {The absorption coefficient and the energy gap of GaP<inf>1-x</inf>N<inf>x</inf> layers has been obtained by spectroscopic ellipsometry for samples grown on Si(001) substrates by chemical beam epitaxy with N mole fractions in the range 0 ≤ x ≤ 0.081. The resulting absorption spectra exhibit a direct band-like behavior near the absorption edge. The absorption coefficient values increase with the N content, reaching values in the range α ∼ 1-2x10$^textrm4$ cm$^textrm−1$ in the vicinity of the absorption edge below the original GaP direct bandgap, which are comparable to those obtained for high efficiency solar cell materials. Furthermore, dependence of the absorption coefficient with increasing N content points to a strong GaP Γ-like character of the conduction-band wave function of GaP<inf>1-x</inf>N<inf>x</inf> alloys near the Brillouin zone center at k = 0, as predicted by the band anticrossing model. Bandgap energy values obtained by spectroscopic ellipsometry are compared with previous values obtained by photoluminescence measurements on the same samples, observing a shift of about 50–100 meV. Finally, the value of the band anticrossing parameter coupling the N level and the host GaP conduction band has been obtained from the dependence of both, the bandgap and the absorption coefficient, with the N content (2.1 and 3.3 eV respectively). © 2024},

note = {Publisher: Elsevier Ltd 

Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{sanchez_toural_diamond-defect_2025-1,

title = {Diamond-defect engineering of NV− centers using ion beam irradiation},

author = {J. L. Sánchez Toural and Julia García-Pérez and R. Bernardo-Gavito and Daniel Granados and Alberto Andrino-Gómez and Gastón García and Jose Luis Pau and Miguel Angel Ramos and Nuria Gordillo},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85210653060&doi=10.1016%2Fj.diamond.2024.111838&partnerID=40&md5=64e606bdf08ea3a60408db10ffeb3ae2},

doi = {10.1016/j.diamond.2024.111838},

issn = {09259635},

year  = {2025},

date = {2025-01-01},

journal = {Diamond and Related Materials},

volume = {151},

abstract = {The interplay between ion beam modification techniques in the MeV range and the controlled generation of negatively charged nitrogen-vacancy (NV$^textrm−$) centers in nitrogen-doped synthetic diamond crystals is explored. An experimental approach employing both light (H$^textrm+$) and heavy (Br$^textrm+6$) ions was followed to assess their respective impacts on the creation of NV$^textrm−$ centers, using different ion energies or fluences to generate varying amounts of vacancies. Photoluminescence spectroscopy was applied to characterize NV$^textrm−$ and neutral NV$^textrm0$ centers. Initially, no NV centers were detected post-irradiation, despite the presence of substitutional nitrogen and vacancies. However, after annealing at 800 °C (and in some cases at 900 °C), most samples exhibited a high density of NV$^textrm0$ and especially NV$^textrm−$ centers. This demonstrates that thermal treatment is essential for vacancy‑nitrogen recombination and NV$^textrm−$ formation, often through electron capture from nearby nitrogen atoms. Notably, we achieved high NV$^textrm−$ densities without graphitization, which is essential for preserving the material's properties for quantum applications. This study underscores and quantifies the effectiveness of MeV-range ions in controlling vacancy distributions and highlights their potential for optimizing NV$^textrm−$ center formation to enhance the sensitivity of diamond-based quantum magnetic sensors. © 2024 The Authors},

note = {Publisher: Elsevier Ltd 

Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ackermann_error_2025,

title = {Error threshold in active steering protocols for few-qubit systems},

author = {Nico Ackermann and Samuel Morales and Alfredo Levy Yeyati and Sebastian Diehl and Reinhold Egger},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85214797183&doi=10.1103%2FPhysRevResearch.7.013045&partnerID=40&md5=2a36cc8a88e661947c1708e182764e96},

doi = {10.1103/PhysRevResearch.7.013045},

issn = {26431564},

year  = {2025},

date = {2025-01-01},

journal = {Physical Review Research},

volume = {7},

number = {1},

publisher = {American Physical Society},

abstract = {We study active steering protocols for weakly measured qubits in the presence of error channels due to amplitude and phase noise. If the error rate is sufficiently small, the protocol approaches and stabilizes a predesignated pure target state with high fidelity and high purity, and thus implements autonomous state stabilization. We present numerical simulation results for one and two qubits, taking Andreev qubit circuits as an example. As a function of the error rate, a sharp threshold separates an error-correcting weak-damping regime from a strong-damping regime where the target state cannot be reached anymore. At the threshold, the purity gap closes. © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{garcia-blazquez_first-principles_2025,

title = {First-principles excitons in periodic systems with Gaussian density fitting and Ewald potential functions},

author = {Manuel Antonio García-Blázquez and J. J. Palacios},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85217817972&doi=10.1103%2FPhysRevResearch.7.013156&partnerID=40&md5=ea0a209b0bc9dca849859d2a845beab8},

doi = {10.1103/PhysRevResearch.7.013156},

issn = {26431564},

year  = {2025},

date = {2025-01-01},

journal = {Physical Review Research},

volume = {7},

number = {1},

publisher = {American Physical Society},

abstract = {Excitons, namely, neutral excitations in a system of electrons arising from the electron-hole interaction, are often essential to explain optical measurements in materials. They are governed by the Bethe-Salpeter equation, which can be cast into a matrix form that is formally analogous to the one for electrons at the mean-field level. However, constructing the corresponding excitonic Hamiltonian in practice is challenging, specially from a computational perspective if one wishes to surpass effective models. Methods that enable such calculations from the different density-functional theory frameworks currently available are, therefore, convenient. In this work, we present an approach to solve the BSE starting from a self-consistent calculation in any nonmetallic solid by evaluating the electron-hole kernel in real space with a localized, Gaussian-type basis. It is based on the Gaussian density fitting or resolution of the identity approximation to reduce the initial quartic scaling in the basis dimension, in combination with the use of Ewald-type potential functions to automatically sum the conditionally convergent lattice series. The method inherits the features of the localized basis, in particular the reduced computational requirements due to the small and tunable Hilbert-space dimension, the natural adaptation to lower-dimensional systems or the possibility to evaluate optical matrix elements exactly. As an illustration of the computational implementation, we provide examples of exciton spectra and optical absorption in some paradigmatic 2D and 3D materials where the single-particle approximation fails qualitatively. © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{bordin_impact_2025,

title = {Impact of Andreev Bound States within the Leads of a Quantum Dot Josephson Junction},

author = {Alberto Bordin and Florian J. Bennebroek Evertsz and Gorm Ole Steffensen and Tom Dvir and Grzegorz P. Mazur and David Driel and Nick Loo and Jan Cornelis Wolff and Erik P. A. M. Bakkers and Alfredo Levy Yeyati and Leonardus Petrus Kouwenhoven},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-86000165551&doi=10.1103%2FPhysRevX.15.011046&partnerID=40&md5=9b8b5c173ba4c8fad525f8ba81918a11},

doi = {10.1103/PhysRevX.15.011046},

year  = {2025},

date = {2025-01-01},

journal = {Physical Review X},

volume = {15},

number = {1},

publisher = {American Physical Society},

abstract = {Detection and control of Andreev bound states (ABSs) localized at semiconductor-superconductor interfaces are essential for their use in quantum applications. Here we investigate the impact of ABSs on the supercurrent through a Josephson junction containing a quantum dot (QD). Additional normal-metal tunneling probes on both sides of the junction unveil the ABSs residing at the semiconductor-superconductor interfaces. Such knowledge provides an ingredient missing in previous studies, improving the connection between theory and experimental data. By varying the ABS energies using electrostatic gates, we show control of the switching current, with the ability to alter it by more than an order of magnitude. Finally, the large degree of ABS tunability allows us to realize a three-site Andreev molecule in which the central QD is screened by both ABSs. This system is studied simultaneously using both supercurrent and spectroscopy. © 2025 authors.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{sanz-garcia_dual_2025-1,

title = {Dual luminescent nano-thermometry based on the selective excitation of optical centers in CaF2:Er3+ nanoparticles},

author = {Juan Antonio Sanz-García and Ginés Lifante and Juan E. Muñoz-Santiuste and Eugenio Cantelar},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208764495&doi=10.1016%2Fj.jallcom.2024.177529&partnerID=40&md5=1438830b4fc3ee98086bba83273a861d},

doi = {10.1016/j.jallcom.2024.177529},

issn = {09258388},

year  = {2025},

date = {2025-01-01},

journal = {Journal of Alloys and Compounds},

volume = {1010},

abstract = {We present a study about the feasibility of using the upconverted luminescence of CaF<inf>2</inf>:Er$^textrm3+$ nanoparticles (NPs), under near infrared excitation within the $^textrm4$I<inf>15/2</inf> → $^textrm4$I<inf>11/2</inf> absorption band, for thermal detection. In order to perform this study, it has been needed to investigate the upconversion processes as function of the Er$^textrm3+$ concentration and the excitation wavelength by using a tunable Ti:Sapphire laser. The results obtained indicate that, under this excitation scheme, the green ($^textrm2$H<inf>11/2</inf>:$^textrm4$S<inf>3/2</inf>) and red ($^textrm4$F<inf>9/2</inf>) emitting levels are populated through different multiphoton processes: Excited state absorption and energy transfer upconversion. Therefore, the ratio between the green and red emissions is also dependent on the Er$^textrm3+$ concentration and the excitation wavelength. Measurements based on site-selective emission/excitation, performed at room temperature, indicate that in these NPs there are at least two different optical centers whose emission bands can be isolated by an appropriate selection of the excitation wavelength. One these centers is compatible with the presence of isolated Er$^textrm3+$ ions, while the other one is tentatively related to the presence of clusters or aggregates. The upconverted luminescence of each optical center is analyzed as function of temperature by means of the ratiometric Fluorescence Intensity Ratio technique. The results indicate that both optical centers exhibit adequate thermal performances and relative sensitivities to be used in thermal sensing. © 2024 The Authors},

note = {Publisher: Elsevier Ltd 

Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{monsel_autonomous_2025,

title = {Autonomous demon exploiting heat and information at the trajectory level},

author = {Juliette Monsel and Matteo Acciai and Rafael Sánchez and Janine Splettstoesser},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85215312836&doi=10.1103%2FPhysRevB.111.045419&partnerID=40&md5=44328ae736badd28e2245e85ae2bb017},

doi = {10.1103/PhysRevB.111.045419},

issn = {24699950},

year  = {2025},

date = {2025-01-01},

journal = {Physical Review B},

volume = {111},

number = {4},

publisher = {American Physical Society},

abstract = {We propose an electronic bipartite system consisting of a working substance, in which a refrigeration process is implemented, and of a nonthermal resource region, containing a combination of different thermal baths. In the working substance, heat is extracted from the coldest of two electronic reservoirs (refrigeration) via heat transport and particle transport through a quantum dot. This quantum dot of the working substance is capacitively coupled to the resource region. In such a setup, a finite cooling power can be obtained in the working substance, while the energy exchange with the resource region exactly cancels out, on average. At the same time, information is always exchanged, even on average, due to the capacitive coupling between the two parts of the bipartite system. The proposed system therefore implements an autonomous demon with fully vanishing heat extraction from the resource. Unlike macroscopic machines, nanoscale machines exhibit large fluctuations in performance, so precision becomes an important performance quantifier. We give a comprehensive description of the thermodynamic performance of the proposed autonomous demon in terms of stochastic trajectories and of full counting statistics and demonstrate that the precision of the cooling power strongly depends on the operation principle of the device. More specifically, the interplay of information flow and counterbalancing heat flows dramatically impacts the trade-off between cooling power, efficiency, and precision. We expect this insight to be of relevance for guiding the design of energy-conversion processes exploiting nonthermal resources. © 2025 authors. Published by the American Physical Society.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{caetano-zeballos_plasmonic_2025,

title = {Plasmonic heating by indium tin oxide nanoparticles: spectrally enabling decoupled near-infrared theranostics},

author = {Nicol Caetano-Zeballos and Leyre Aldaz-Caballero and Jesús Giráldez-Martínez and Lucas V. Besteiro and Marta Quintanilla and Riccardo Marin and Antonio Benayas},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85216749402&doi=10.1039%2Fd4nr04212c&partnerID=40&md5=d117b75ccd3f436f71e965a159349468},

doi = {10.1039/d4nr04212c},

issn = {20403364},

year  = {2025},

date = {2025-01-01},

journal = {Nanoscale},

volume = {17},

number = {8},

pages = {4455 – 4464},

publisher = {Royal Society of Chemistry},

abstract = {All-optical theranostic systems are sought after in nanomedicine, since they combine in a single platform therapeutic and diagnostic capabilities. Commonly in these systems the therapeutic and diagnostic/imaging functions are accomplished with plasmonic photothermal agents and luminescent nanoparticles (NPs), respectively. For maximized performance and minimized side effects, these two modalities should be independently activated, i.e., in a decoupled way, using distinct near infrared (NIR) wavelengths: a radiation window wherein photon-tissue interaction is reduced. Yet, to date, a fully decoupled NIR theranostics system is not available. Finding plasmonic NPs working in that range and without spectral overlap with the absorption and emission of state-of-the-art NIR luminescent NPs requires the development of new materials specifically designed for this purpose. To address this limitation, we herein present water-dispersible indium tin oxide (ITO) NPs whose surface plasmon resonance was tuned for exclusive operation in the third biological window (NIR-III, 1500-1800 nm). That leaves available the first and second biological windows, in which diagnostic tools are typically working. Both the microwave-assisted synthesis and the water-transfer protocol were optimized to obtain NPs with maximum light-to-heat conversion capabilities, owing to their small size and reduced aggregation in aqueous media. Proof-of-concept experiments showed that the lack of overlap between the absorption of ITO NPs and the absorption/emission of model near infrared luminescent species (the widely used Nd$^textrm3+$-doped NPs) is an asset when devising an all-optical theranostics platform. The obtained results set the stage for the development of a new generation of high-performance, all-optical theranostic systems with minimized side effects. © 2025 The Royal Society of Chemistry.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{gundin_spin_2025,

title = {Spin Noise Spectroscopy of a Single Spin Using Single Detected Photons},

author = {Manuel Gundín and Paul Hilaire and Clément Millet and Elham Mehdi and Carlos Antón-Solanas and Abdelmounaim Harouri and Aristide Lemaître and Isabelle Sagnes and Niccolò Somaschi and Olivier Krebs and Pascale Senellart and Loïc Lanco},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85216324846&doi=10.1103%2FPhysRevLett.134.036902&partnerID=40&md5=8d1957e351a0a22c84db6fb2797c1d9f},

doi = {10.1103/PhysRevLett.134.036902},

issn = {00319007},

year  = {2025},

date = {2025-01-01},

journal = {Physical Review Letters},

volume = {134},

number = {3},

publisher = {American Physical Society},

abstract = {Spin noise spectroscopy has become a widespread technique to extract information on spin dynamics in atomic and solid-state systems, in a potentially nonperturbative way. Here we experimentally demonstrate a new approach in spin noise spectroscopy, based on the detection of single photons. Because of the large spin-dependent polarization rotations provided by a deterministically coupled quantum dot-micropillar device, giant spin noise signals induced by a single-hole spin are extracted in the form of photon-photon cross-correlations. Ultimately, such a technique can be extended to an ultrafast regime probing mechanisms down to few tens of picoseconds. © 2025 American Physical Society.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{sebastian-vicente_photovoltaic_2025,

title = {Photovoltaic Charge Lithography on Passive Dielectric Substrates Using Fe:LiNbO3 Stamps},

author = {Carlos Sebastián-Vicente and Riccardo Zamboni and Ángel García-Cabañes and Mercedes Carrascosa},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85205676617&doi=10.1002%2Faelm.202400327&partnerID=40&md5=38f63b0854e81f1be4e0333613156a35},

doi = {10.1002/aelm.202400327},

year  = {2025},

date = {2025-01-01},

journal = {Advanced Electronic Materials},

volume = {11},

number = {2},

publisher = {John Wiley and Sons Inc},

abstract = {Photovoltaic Fe:LiNbO<inf>3</inf> is an outstanding material platform able to photo-generate versatile charge patterns, useful for a broad variety of applications. However, in some cases, its photorefractive effect, light absorption, and active ferroelectric properties may interfere with the optimum operation of certain devices based on Fe:LiNbO<inf>3</inf>. Here, a novel optoelectronic method is proposed and demonstrated to transfer photovoltaic charge patterns from Fe:LiNbO<inf>3</inf> to non-photovoltaic passive substrates, thus removing these possible limitations. The method, denominated as photovoltaic charge lithography (PVCL), resembles the operation of a stamp and does not require external high-voltage supplies or electron/ion beams. Upon contact between the active Fe:LiNbO<inf>3</inf> stamp and a passive dielectric substrate, the light-induced charge pattern can be faithfully mirrored on the passive substrate. The imprinted pattern is probed and characterized by dielectrophoretic and electrophoretic particle trapping. The results reveal that the charge builds up on the passive substrate during contact, allowing charge tunability. Moreover, arbitrary charge distributions can be flexibly tailored, using scanning laser beams or spatially structured light. Overall, PVCL opens the possibility of printing complex 1D/2D charge patterns of controlled polarity on different passive dielectric materials, enhancing the technological potential of Fe:LiNbO<inf>3</inf> photovoltaic platforms. © 2024 The Author(s). Advanced Electronic Materials published by Wiley-VCH GmbH.},

note = {Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{rached_effects_2025-1,

title = {Effects of the substitution in the two sites on barium titanate properties},

author = {A. Rached and Mohammed Amine Wederni and Sahbi Alaya and R. J. Martín-Palma and Kamel Khirouni},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85211161739&doi=10.1016%2Fj.inoche.2024.113675&partnerID=40&md5=b15c074db8a56f42b845aa5fcbfe64c2},

doi = {10.1016/j.inoche.2024.113675},

issn = {13877003},

year  = {2025},

date = {2025-01-01},

journal = {Inorganic Chemistry Communications},

volume = {172},

abstract = {Barium titanate compound has been studied given their many interesting physico-chemical properties, including their dielectric and ferroelectric behavior. Besides, the introduction of different elements in the barium titanate matrix increases the number of applications in which these compounds can be used. Within this context, in the present work we investigated the effect of doping barium titanate with alkali ions (Ca) and rare earth ions (Er) in Ba sites and by tin ions in Ti sites. The synthesized compound, termed BETS-Ca, was prepared via a solid–solid reaction technique. X-ray diffraction measurements indicated that the material has a tetragonal symmetry structure. Scanning electron microscopy analysis allowed to identify a dense microstructure with the existence of both grain and grain boundaries. Moreover, optical absorbance and infrared spectra indicated the incorporation of doping elements such as erbium and tin. Additionally, the electric and dielectric properties of the compounds were investigated. AC conductivity analysis suggested that conduction is governed by correlated barriers hopping and non overlapping small polaron tunneling processes. Nyquist plot showed the contribution of both grain and grain boundaries to the conduction. Finally, a ferroelectric-paraelectric transition was found around a specific temperature (T<inf>C</inf> = 360 K). According to the Curie-Weiss law, this transition has a diffusive character. © 2024 Elsevier B.V.},

note = {Publisher: Elsevier B.V. 

Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{tabares_mose2xte22x_2025-1,

title = {MoSe2xTe2–2x alloy for hydrogen gas detection},

author = {Gema Tabares and Rául Magro and L. F. Vazquez and Alejandro Fernandez and Nuria Gordillo},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85211967844&doi=10.1016%2Fj.sna.2024.116126&partnerID=40&md5=e8db820de83636feb45272ea1fef29de},

doi = {10.1016/j.sna.2024.116126},

issn = {09244247},

year  = {2025},

date = {2025-01-01},

journal = {Sensors and Actuators A: Physical},

volume = {382},

abstract = {This study presents one of the first detailed investigation into the out-of-plane growth of two-dimensional MoSe<inf>2x</inf>Te<inf>2–2x</inf> for three distinct Se:Te compositions, yielding the samples MoSe<inf>0.46</inf>Te<inf>1.55</inf>, MoSe<inf>0.55</inf>Te<inf>1.45</inf>, and MoSe<inf>0.64</inf>Te<inf>1.35</inf>. Scanning electron microscopy reveals the morphological evolution, showcasing nanoflakes predominantly grown in a random out-of-plane orientation. Raman spectroscopy confirms the crystal structure of MoSe<inf>2x</inf>Te<inf>2–2x</inf> samples, with no detectable traces of MoO<inf>3</inf> or MoO<inf>2</inf> precursors. Distinctive peaks validate the presence of MoSe<inf>2x</inf>Te<inf>2–2x</inf>, while spectral shifts suggest at compositional variations. Conductive-Atomic Force Microscopy (C-AFM) was used to quantify current flow between a diamond-doped AFM tip and the sample. Additionally, the resistances of compositions MoSe<inf>0.46</inf>Te<inf>1.55</inf>, MoSe<inf>0.55</inf>Te<inf>1.45</inf>, and MoSe<inf>0.64</inf>Te<inf>1.35</inf> were characterized, yielding median values of 108.0 Ω, 25.4 kΩ, and 240.0 kΩ, respectively, indicating diverse electrical properties associated with Se content. Notably, the sample with the highest Se content exhibits increased resistivity as anticipated, consistent with XRD spectra results. Finally, gas-sensing performance is evaluated by assessing electrical resistance variations before and after exposure to H<inf>2</inf> gas at various temperatures, revealing significant changes indicative of enhanced charge flow upon H<inf>2</inf> exposure. © 2024 The Authors},

note = {Publisher: Elsevier B.V. 

Type: Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}