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Condensed Matter
Scopus
ISSN 2410-3896 · MDPI AG · 626 artikel di indeks
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Artikel Jurnal Teks lengkap
Hidden Universal Metal in Cuprate Superconductors
Nuclear relaxation, 1/T1, is a very robust probe of electronic excitations in superconducting materials above and below the critical temperature of superconductivity, Tc. Here, a relaxation phenomenology of hole-doped cuprate superconductors is presented based on the majority of the available…
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Phonon Softening Due to the Coupling with Charge Density Fluctuations in High-Temperature Superconducting Cuprates
Bond-stretching phonons in hole-doped cuprates exhibit pronounced anomalies in momentum regions where charge correlations are observed, indicating a strong coupling between lattice dynamics and the charge sector. Motivated by this phenomenology, we develop a minimal theoretical framework to clarify…
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On the Electronic Properties of Gold Quantum Dots at a Finite Temperature
Gold nanoparticles are of interest in a broad class of research fields, ranging from the basic sciences through technology to the biosciences. Not only are the environments in which they are investigated very diverse, but the temperature range is also very wide, going from cryogenic temperatures to…
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DFT-Guided Molecular Engineering of Donor–Bridge–Acceptor Semiconductors for Organic Photovoltaics Solar Cells
Organic semiconductors offer a potential class of materials for organic photovoltaic (OPV) applications due to their tunable optoelectronic properties and low-cost processing. A methodical DFT/TD-DFT study of a library of organic donor–π–acceptor (D–π–A) compounds based on triphenylamine donors…
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Delayed Conceptual Unification in the Theory of Hole Superconductivity
The theory of hole superconductivity has developed over more than three decades through a sequence of steps addressing distinct physical problems. This paper identifies and documents a recurring structural pattern in that development: ideas introduced to solve one problem were only later recognized…
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Enhancing X-Ray and Gamma-Ray Detector Calibration via AI-Driven Digital Twins: Predicting Extracorporeal Photon Emission from OpenDose Specific Absorbed Fraction Datasets Using Uncertainty-Aware Transformer Ensembles
Patient-specific dosimetry and quantitative external counting for in vivo monitoring of radiopharmaceutical therapies require detector calibration coefficients (k) that are currently obtained through computationally intensive Monte Carlo (MC) simulations. We present a digital-twin framework that…
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Wakefield Acceleration in Gamma-Ray Bursts
Gamma-ray bursts (GRBs) represent the most powerful explosions in the Universe, releasing extreme fluxes of non-thermal radiation across the electromagnetic spectrum. A central enigma in GRB physics remains the mechanism responsible for accelerating electrons, positrons, and hadrons to the required…
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The Interplay of Thermal Melting and Pump-Driven Melting of Charge Order: A Two-Temperature Study of the Holstein Model
Charge order driven by electron–phonon coupling is well understood at equilibrium but pump-probe experiments raise a new question: how does this order melt and recover after strong photoexcitation? A pump pulse promotes carriers across the charge-order gap and creates a nonequilibrium high-energy…
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Piezoelectric Double Layer Pressure Sensors: An Analytical Study and Multiphysics Simulation
This study presents both the analytical modeling and simulation of a cantilever pressure sensor with double-layer piezoelectric materials, specifically ZnO and PVDF, which have negative and positive voltage coefficients, in order to investigate the performance of the sensor and to validate the…
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Two-Dimensional Tunable Reactance Element Free from Electromagnetic Coupling
A capacitor modeled as a parallel combination of a resistance (R) and a capacitance (C) exhibits three distinct operating regimes when both parameters depend on the applied voltage (V): a positive-capacitance regime (dR/R>dV/V), an Ohmic regime (dR/R=dV/V), and a negative-capacitance regime (dR/R
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Bridging Quantum Capacitance and Experimental Electrochemical Performance in 2D Materials for Supercapacitors: From Density of States to Device-Level Interpretation
Two-dimensional (2D) materials, particularly MXenes and transition metal dichalcogenides (TMDs), have attracted intense interest as supercapacitor electrodes due to their high surface area and tunable electronic structure. However, large discrepancies persist between the quantum capacitance values…
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Measurements of Electronic Band Structure in CeCoGe3 by Angle-Resolved Photoemission Spectroscopy
In this paper, we present a comprehensive study of the electronic structure of CeCoGe3 throughout the entire Brillouin zone in the non-magnetic regime using angle-resolved photoemission spectroscopy (ARPES). The electronic structure agrees in large part with first principles calculations, including…
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Laser-Spot Step-Heating Thermography for Non-Destructive Evaluation of Thermal Diffusivity in Apples
In this work, thermal imaging is employed to study the opto-thermal response of apples (Malus domestica Borkh.), assessing their post-harvest evolution through the estimation of thermal diffusivity. A non-destructive experimental procedure based on mid-wave infrared (MWIR) thermal camera (3–5 µm)…
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Insights into Neutral vs. Deprotonated Phenol Adsorption on Graphene Oxide
Water pollution from phenols remains a critical concern due to their persistence, toxicity, and industrial prevalence. Graphene oxide (GOx), with its functional groups and large surface area, offers strong adsorption potential. Using density functional theory (DFT), reduced density gradient (RDG)…
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Electron Correlation and High-Temperature Superconductivity
Strong electron correlation plays a central role in the high-temperature superconductivity (HTSC) of cuprates. However, to date, research has focused only on its role in spin dynamics and related effects, even though it is becoming increasingly clear that spin alone may not be sufficient to create…
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Two-Carrier Description of Cuprate Superconductors from NMR
Cuprates currently hold the record for the highest temperature superconductivity at ambient pressure, but the microscopic understanding of these materials remains elusive. Here, we utilize nuclear magnetic resonance (NMR) data of planar oxygen and copper from essentially all hole-doped cuprates to…
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Solid-State Detector for FLASH Radiotherapy: Dosimetric Applications and Emerging Concepts
The implementation of FLASH Radiotherapy (FLASH-RT), characterized by ultra-high dose rates (UHDRs) frequently exceeding 106 Gy/s in microsecond pulses, imposes stringent requirements on real-time dosimetry. Conventional ionization chambers suffer severe ion recombination and space-charge…
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First-Principles Study of the Formation and Stability of the Interstitial and Substitutional Hydrogen Impurity in Magnesium Oxide
Hydrogen is frequently incorporated in alkaline-earth oxides during crystal growth or post-deposition annealing. For MgO, several studies in the past showed that interstitial monatomic hydrogen can also favourably bind with oxygen vacancies to form stable substitutional defect complexes…
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The Universe Observed with Particle Detectors: Astrophysical Legacy of Guido Barbiellini Amidei
The development of modern high-energy astrophysics has been deeply intertwined with advances in particle detector technology. Guido Barbiellini Amidei (1943–2024) played a pivotal role in bridging experimental particle physics and astrophysical observation. His scientific career spanned over four…
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Using Machine-Learned Force Fields for Describing Heat-Transport-Related Quantities in AlGaN and Derived Materials
In this work, we develop machine-learned moment tensor potentials (MTPs) to simulate the static and dynamic structural properties in AlxGa1−xN and related materials. The potentials are trained on DFT-calculated data for forces, stresses, and energies obtained from random atomic displacements and…