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Phase-Manipulation-Induced Majorana Mode and Braiding Realization in Iron-Based Superconductor Fe(Te,Se)

Physical Review Letters 2022年第1期128卷 016402-016402页

作者： Rui Song Ping Zhang Ning Hao HEDPS Center for Applied Physics and Technology and School of Physics Peking University Beijing 100871 China HEDPS Center for Applied Physics and Technology and School of Engineering Peking University Beijing 100871 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Anhui Chinese Academy of Sciences and University of Science and Technology of China Hefei China School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China Beijing Computational Science Research Center Beijing 100084 China

A recent experiment reported the evidence of dispersing one-dimensional Majorana mode trapped by the crystalline domain walls in FeSe0.45Te0.55. Here, we perform the first-principles calculations to show that iron atoms in the domain wall spontaneously form the ferromagnetic order in line with orientation of the wall. The ferromagnetism can impose a π phase difference between the domain-wall-separated surface superconducting regimes under the appropriate width and magnetization of the wall. Accordingly, the topological surface superconducting state of FeSe0.45Te0.55 can give rise to one-dimensional Majorana modes trapped by the wall. More interestingly, we further propose a surface junction in the form of FeSe0.45Te0.55-ferromagnet-FeSe0.45Te0.55, which can be adopted to create and fuse the Majorana zero modes through controlling the width or magnetization of the interior ferromagnetic barrier. The braiding and readout of Majorana zero modes can be realized by the designed device. Such surface junction has the potential application in the superconducting topological quantum computation.

关键词： First-principles calculations Majorana bound states Superconductivity Topological superconductors Iron-based superconductors

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Light controlled topological plasmonics in a graphene lattice arrayed by metal nanoparticles

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Physical Review B 2023年第8期108卷 085402-085402页

作者： Lu Zhang Xi-Ming Wang Xin-Miao Qiu Zhigang Wang Jie-Yun Yan School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China

The implementation of topology on photonics has opened new functionalities of photonic systems, such as the topologically protected boundary photonic modes. In this study, we investigate topological plasmonics in a graphene lattice arrayed with metal nanoparticles and irradiated by a polarized light. While surface plasmon polaritons are typically excited in such systems, our study shows that the system exhibits a different photonic response with observable edge photonic modes corresponding to distinct topological states. Importantly, we show that the topological phase transition between these states can be easily achieved by controlling the polarization of the external optical field, making it more feasible in experiments than changing the structural parameters. Our system provides a controllable platform for studying topological phenomena in photonics and has potential applications in nanoscale optical devices.

关键词： Plasmonics Topological phase transition Polarization

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THEORETICAL STUDY OF INELASTIC PROCESSES IN COLLISIONS OF Y AND Y+ WITH HYDROGEN ATOM

arXiv

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arXiv 2023年

作者： Wang, Yu Alexeeva, Sofya Wang, Feng Liu, Ling Wu, Yong Wang, JianGuo Zhao, Gang Yakovleva, Svetlana A. Belyaev, Andrey K. School of Physics Beijing Institute of Technology Beijing100081 China CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Beijing100101 China Data Center for High Energy Density Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China Department of Theoretical Physics and Astronomy Herzen University St Petersburg191186 Russia

Utilizing a simplified quantum model approach, the low-energy inelastic collision processes between yttrium atoms (ions) and hydrogen atoms have been studied. Rate coefficients corresponding to the mutual neutralization, ion-pair formation, excitation, and de-excitation processes for the above collision systems have been provided in the temperature range of 1000-10000K. 3 ionic states and 73 covalent states are considered in calculations for the collisions of yttrium atoms with hydrogen atoms, which include 6 molecular symmetries and 4074 partial inelastic reaction processes. For the collisions of yttrium ions with hydrogen atoms, 1 ionic state and 116 covalent states are included, which related to 3 molecular symmetries and 13572 partial inelastic collision processes. It is found that the rate coefficients for the mutual neutralization process have a maximum at T = 6000K, which is an order of magnitude higher than those of other processes. Notably, the positions of optimal windows for the collisions of yttrium atoms and ions with hydrogen atoms are found near electronic binding energy -2eV (Y) and -4.4eV (Y+), respectively. The scattering channels located in or near these optimal windows have intermediate-to-large rate coefficients (greater than 10−12 cm3s−1). The reported data should be useful in the study of non-local thermodynamic equilibrium modeling. © 2023, CC BY.

关键词： Atoms

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LOCAL REGULARITY FOR NONLINEAR ELLIPTIC AND PARABOLIC EQUATIONS WITH ANISOTROPIC WEIGHTS

arXiv

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arXiv 2022年

作者： Miao, Changxing Zhao, Zhiwen Beijing Computational Science Research Center Beijing100193 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing100088 China

The main purpose of this paper is to capture the asymptotic behavior for solutions to a class of nonlinear elliptic and parabolic equations with the anisotropic weights consisting of two power-type weights of different dimensions near the degenerate or singular point, especially covering the weighted p-Laplace equations and weighted fast diffusion equations. As a consequence, we also establish the local Hölder estimates for their solutions in the presence of single power-type weights. Copyright © 2022, The Authors. All rights reserved.

关键词： Anisotropy

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Vortex inverted pin beams: Mitigation of scintillations in strong atmospheric turbulence

arXiv

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arXiv 2024年

作者： Droulias, Sotiris Loulakis, Michalis Papazoglou, Dimitris G. Tzortzakis, Stelios Chen, Zhigang Efremidis, Nikolaos K. Institute of Applied and Computational Mathematics Foundation for Research and Technology - Hellas Crete Heraklion70013 Greece Institute of Electronic Structure and Laser Foundation for Research and Technology - Hellas Crete Heraklion70013 Greece Department of Materials Science and Technology University of Crete Crete Heraklion70013 Greece MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics Institute School of Physics Nankai University Tianjin300457 China Department of Mathematics and Applied Mathematics University of Crete Crete Heraklion70013 Greece

We recently introduced a new class of optical beams with a Bessel-like transverse profile and increasing beam width during propagation, akin to an "inverted pin". Owing to their specially engineered distribution, these beams have shown remarkable performance in atmospheric turbulence. Specifically, inverted pin beams were found to have reduced scintillation index as compared to collimated or focused Gaussian beams as well as other types of pin beams especially in moderate to strong turbulence. In this work, we demonstrate that inverted pin beams carrying orbital angular momentum can further suppress intensity scintillations in moderate to strong irradiance fluctuation conditions. Our results can be useful in improving the performance and link availability of free-space optical communication systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Atmospheric turbulence

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Active Axial Motion Compensation in Multiphoton-Excited Fluorescence Microscopy

arXiv

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arXiv 2024年

作者： Kunisch, Manuel Beutler, Sascha Pilger, Christian Kiefer, Friedemann Huser, Thomas Wirth, Benedikt Department of Physics Bielefeld University Bielefeld33615 Germany Institute for Computational and Applied Mathematics University of Münster Münster48149 Germany European Institute for Molecular Imaging University of Münster Münster48149 Germany

In living organisms, the natural motion caused by the heartbeat, breathing, or muscle movements leads to the deformation of tissue caused by translation and stretching of the tissue structure. This effect results in the displacement or deformation of the plane of observation for intravital microscopy and causes motion-induced aberrations of the resulting image data. This, in turn, places severe limitations on the time during which specific events can be observed in intravital imaging experiments. These limitations can be overcome if the tissue motion can be compensated such that the plane of observation remains steady. We have developed a mathematical shape space model that can predict the periodic motion of a cylindrical tissue phantom resembling blood vessels. This model is then used to rapidly calculate the future position of the plane of observation of a confocal multiphoton fluorescence microscope. The focal plane is continuously adjusted to the calculated position with a piezo-actuated objective lens holder. We demonstrate active motion compensation for non-harmonic axial displacements of the vessel phantom with a field of view up to 400 μm × 400 μm, vertical amplitudes of more than 100 μm, and at a rate of 0.5 Hz. Copyright © 2024, The Authors. All rights reserved.

关键词： Motion compensation

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Reconstructing the spacetime dual to a free matrix

arXiv

引用

arXiv 2024年

作者： de Mello Koch, Robert Roy, Pratik Van Zyl, Hendrik J.R. School of Science Huzhou University Huzhou313000 China School of Physics and Mandelstam Institute for Theoretical Physics University of the Witwatersrand Wits2050 South Africa The Laboratory for Quantum Gravity & Strings Department of Mathematics & Applied Mathematics University of Cape Town Cape Town South Africa The National Institute for Theoretical and Computational Sciences Private Bag X1 Matieland South Africa

In this paper we consider the collective field theory description of the singlet sector of a free matrix field in 2+1 dimensions. This necessarily involves the study of k-local collective fields, which are functions of 2k + 1 coordinates. We argue that these coordinates have a natural interpretation: the k-local collective field is a field defined on an AdS4×Sk−2×Sk−1 spacetime. The modes of a harmonic expansion on the Sk−2×Sk−1 portion of the spacetime leads to the spinning bulk fields of the dual gravity theory. Copyright © 2024, The Authors. All rights reserved.

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Machine learning interatomic potential for molecular dynamics simulation of the ferroelectric KNbO3 perovskite

引用

Physical Review B 2023年第1期107卷 014101-014101页

作者： Hao-Cheng Thong XiaoYang Wang Jian Han Linfeng Zhang Bei Li Ke Wang Ben Xu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China Graduate School China Academy of Engineering Physics Beijing 100193 People's Republic of China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 People's Republic of China Beijing Institute of Big Data Research Beijing 100871 People's Republic of China School of Materials Science and Engineering Research Center for Materials Genome Engineering Wuhan University of Technology Wuhan 430070 People's Republic of China

Ferroelectric perovskites have been ubiquitously applied in piezoelectric devices for decades, among which ecofriendly lead-free (K,Na)NbO3−based materials have been recently demonstrated to be an excellent candidate for sustainable development. Molecular dynamics is a versatile theoretical calculation approach for the investigation of the dynamical properties of ferroelectric perovskites. However, molecular dynamics simulation of ferroelectric perovskites has been limited to simple systems, since the conventional construction of interatomic potential is rather difficult and inefficient. In the present study, we construct a machine-learning interatomic potential of KNbO3 [as a representative system of (K,Na)NbO3] by using a deep neural network model. Including first-principles calculation data into the training data set ensures the quantum-mechanics accuracy of the interatomic potential. The molecular dynamics based on machine-learning interatomic potential shows good agreement with the first-principles calculations, which can accurately predict multiple fundamental properties, e.g., atomic force, energy, elastic properties, and phonon dispersion. In addition, the interatomic potential exhibits satisfactory performance in the simulation of domain wall and temperature-dependent phase transition. The construction of interatomic potential based on machine learning could potentially be transferred to other ferroelectric perovskites and consequently benefit the theoretical study of ferroelectrics.

关键词： Domain walls Elasticity Ferroelectricity First-principles calculations Phase transitions Phonons Piezoelectricity Machine learning Molecular dynamics

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A Unified Approach to Inferring Chemical Compounds with the Desired Aqueous Solubility

arXiv

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arXiv 2024年

作者： Batool, Muniba Azam, Naveed Ahmed Zhu, Jianshen Haraguchi, Kazuya Zhao, Liang Akutsu, Tatsuya Discrete Mathematics and Computational Intelligence Laboratory Department of Mathematics Quaid-i-Azam University Pakistan Discrete Mathematics Laboratory Department of Applied Mathematics and Physics Graduate School of Informatics Kyoto University Kyoto606-8501 Japan Kyoto University Kyoto606-8306 Japan Bioinformatics Center Institute for Chemical Research Kyoto University Uji611-0011 Japan

Aqueous solubility (AS) is a key physiochemical property that plays a crucial role in drug discovery and material design. We report a novel unified approach to predict and infer chemical compounds with the desired AS based on simple deterministic graph-theoretic descriptors, multiple linear regression (MLR) and mixed integer linear programming (MILP). Selected descriptors based on a forward stepwise procedure enabled the simplest regression model, MLR, to achieve significantly good prediction accuracy compared to the existing approaches, achieving the accuracy in the range [0.7191, 0.9377] for 29 diverse datasets. By simulating these descriptors and learning models as MILPs, we inferred mathematically exact and optimal compounds with the desired AS, prescribed structures, and up to 50 non-hydrogen atoms in a reasonable time range [6, 1204] seconds. These findings indicate a strong correlation between the simple graph-theoretic descriptors and the AS of compounds, potentially leading to a deeper understanding of their AS without relying on widely used complicated chemical descriptors and complex machine learning models that are computationally expensive, and therefore difficult to use for inference. An implementation of the proposed approach is available at https://***/ku-dml/mol-infer/tree/master/AqSol. © 2024, CC BY.

关键词： Solubility

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Infinitely many non-conservative solutions for the three-dimensional Euler equations with arbitrary initial data in C1/3−Ε

arXiv

引用

arXiv 2022年

作者： Khor, Calvin Miao, Changxing Ye, Weikui Beijing Computational Science Research Center Beijing100193 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing100088 China

Let 0 x,tβ to the three-dimensional Euler equations that do not conserve the energy, for a given initial data in C(Equation presented). We also show that there is some limited control on the increase in the energy fo... 详细信息

关键词： Euler equations

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