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Phase-manipulation-induced Majorana Mode and Braiding Realization in Iron-based Superconductor Fe(Te,Se)

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arXiv 2021年

作者： Song, Rui Zhang, Ping Hao, Ning HEDPS Center for Applied Physics and Technology School of Physics Peking University Beijing100871 China HEDPS Center for Applied Physics and Technology School of Engineering Peking University Beijing100871 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Anhui Chinese Academy of Sciences University of Science and Technology of China Hefei China School of Physics and Physical Engineering Qufu Normal University Qufu273165 China Institute of Applied Physics and Computational Mathematics Beijing100088 China Beijing Computational Science Research Center Beijing100084 China

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. Copyright © 2021, The Authors. All rights reserved.

关键词： Ferromagnetism

Ultrafast Hole Deformation Revealed by Molecular Attosecond Interferometry

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Ultrafast Science 2021年第1期1卷 68-79页

作者： Yindong Huang Jing Zhao Zheng Shu Yalei Zhu Jinlei Liu Wenpu Dong Xiaowei Wang Zhihui Lü Dongwen Zhang Jianmin Yuan Jing Chen Zengxiu Zhao Department of Physics National University of Defense TechnologyChangshaHunanChina Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijingChina Institute of Applied Physics and Computational Mathematics BeijingChina Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyangSichuanChina Graduate School of China Academic of Engineering Physics BeijingChina Shenzhen Key Laboratory of Ultra Intense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhenChina

Understanding the evolution of molecular electronic structures is the key to explore and control photochemical reactions and photobiological *** to strong laser fields,electronic holes are formed upon ionization and evolve in the attosecond *** is crucial to probe the electronic dynamics in real time with attosecond-temporal and atomic-spatial ***,we present molecular attosecond interferometry that enables the in situ manipulation of holes in carbon dioxide molecules via the interferometry of the phase-locked electrons(propagating in opposite directions)of a laser-triggered rotational wave *** joint measurement on high-harmonic and terahertz spectroscopy(HATS)provides a unique tool for understanding electron dynamics from picoseconds to *** optimum phases of two-color pulses for controlling the electron wave packet are precisely determined owing to the robust reference provided with the terahertz pulse *** is noteworthy that the contribution of HOMO-1 and HOMO-2 increases reflecting the deformation of the hole as the harmonic order *** method can be applied to study hole dynamics of complex molecules and electron correlations during the strong-field *** threefold control through molecular alignment,laser polarization,and the two-color pulse phase delay allows the precise manipulation of the transient hole paving the way for new advances in attochemistry.

关键词： polarization second interferometry

Giant inverse Rashba-Edelstein effect: Application to monolayer OsBi2

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arXiv 2021年

作者： Song, Rui Hao, Ning Zhang, Ping HEDPS Center for Applied Physics and Technology and School of Physics Peking University Beijing100871 China HEDPS Center for Applied Physics and Technology and School of Engineering Peking University Beijing100871 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei Anhui230031 China Institute of Applied Physics and Computational Mathematics Beijing100088 China School of Physics and Physical Engineering Qufu Normal University Qufu273165 China Beijing Computational Science Research Center Beijing100084 China

We propose that the hybridization between two sets of Rashba bands can lead to an unconventional topology where the two Fermi circles from different bands own in-plane helical spin textures with the same chiralities, and possess group velocities with the same directions. Under the weak spin injection, the two Fermi circles both give the positive contributions to the spin-to-charge conversion and thus induce the giant inverse Rashba-Edelstein Effect with large conversion efficiency, which is very different from the conventional Rashba-Edelstein Effect. More importantly, through the first-principles calculations, we predict that monolayer OsBi2could be a good candidate to realize the giant inverse Rashba-Edelstein Effect. Our studies not only demonstrate a new mechanism to achieve highly efficient spin-to-charge conversion in spintronics, but also provide a promising material to realize it. Copyright © 2021, The Authors. All rights reserved.

关键词： Monolayers

State-selective single-electron capture in intermediate-energy C4+ + He collisions

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Physical Review A 2021年第3期103卷 032827-032827页

作者： D. L. Guo J. W. Gao S. F. Zhang X. L. Zhu Y. Gao D. M. Zhao R. T. Zhang Y. Wu J. G. Wang A. Dubois X. Ma Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China GSI Helmholtzzentrum für Schwerionenforschung D-64291 Darmstadt Germany School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu 610064 China Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China Center for Applied Physics and Technology HEDPS and School of Physics Peking University Beijing 100871 China Sorbonne Université CNRS Laboratoire de Chimie Physique-Matière et Rayonnement F-75005 Paris France

A combined experimental and theoretical study on single capture in 15–50keV/uC4+ + He collisions was performed. State-selective single-electron capture cross sections and projectile scattering angle distributions were obtained by using a reaction microscope. A comparison of the state-selective cross sections with theoretical calculations based on the two-active-electron semiclassical atomic-orbital close-coupling method showed an excellent agreement for the considered impact energies. For the angular differential cross sections, an overall agreement was also obtained between the present experimental and theoretical results. Simulations performed using an extended Fraunhofer-type diffraction model suggest that the undulatory structures observed at small scattering angles for capture to C3+(1s22s) and C3+(1s22p0) can be interpreted as the diffraction pattern of the incident projectile de Broglie wave confined by an aperture defined as the region around the target where the considered capture process is likely. The strong competition between single-electron capture to C3+(1s22p0) and C3+(1s22p1) is also discussed to interpret the differences observed between their respective differential cross sections.

关键词： Atomic & molecular collisions Charge-transfer collisions

Composite Neutrosophic Finite Automata

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Neutrosophic Sets and Systems 2020年第1期36卷 282-291页

作者： Kavikumar, J. Nagarajan, D. Tiwari, S.P. Broumi, Said Smarandache, Florentin Center of Research in Computational Mathematics Faculty of Applied Sciences and Technology Universiti Tun Hussein Onn Malaysia Malaysia Department of Mathematics Hindustan Institute of Technology & Science India Dhanbad826004 India University of Hassan II Casablanca Morocco Department of Mathematics University of New Mexico GallupNM87301 United States

The idea behind the neutrosophic set is we can connect the concept by dynamics of opposite interacts and its neutral that are uncertain and get common parts. Automata theory is beneficial to solve computational complexity problem and also it is an influential mathematical modeling tool in computer science. Inspired by the concepts of neutrosophic sets and automata theory, here, we are introducing and discussing the algebraic concept of neutrosophic finite automata based on the paper [10]. Generally, composite machines can be achieved by the output of the one machine that will be used as input for another machines. This paper introduced the concept of composite automata under the environment of the neutrosophic set and also examined the box function between the composite neutrosophic finite automata. © 2021

关键词： computational complexity

Unified gas-kinetic wave-particle methods VI: Disperse dilute gas-particle multiphase flow

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arXiv 2021年

作者： Yang, Xiaojian Liu, Chang Ji, Xing Shyy, Wei Xu, Kun Department of Mechanical and Aerospace Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Institute of Applied Physics and Computational Mathematics Beijing China Department of Mathematics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications Hong Kong University of Science and Technology Hong Kong Shenzhen Research Institute Hong Kong University of Science and Technology Shenzhen Hong Kong

In this paper, a unified gas-kinetic wave-particle scheme (UGKWP) for the disperse dilute gas-particle multiphase flow is proposed. In this study, the gas phase is always in the hydrodynamic regime. However, the particle phase covers different flow regimes from particle trajectory crossing to the hydrodynamic wave interaction with the variation of local particle phase Knudsen number. The UGKWP is an appropriate method for the capturing of the multiscale transport mechanism in the particle phase through its coupled wave-particle formulation. In the regime with intensive particle collision, the evolution of solid particle will be followed by the analytic wave with quasi-equilibrium distribution;while in the rarefied regime the non-equilibrium particle phase will be captured through particle tracking and collision, which plays a decisive role in recovering particle trajectory crossing behavior. The gas phase in the multiphase system is assumed to be stay in the continuum flow regime, and its evolution is mainly controlled by the Navier-Stokes equations with the interaction with particle phase. The gas-kinetic scheme (GKS) is employed for the simulation of gas flow. In the highly collision regime for the particles, no particles will be sampled in UGKWP and the wave formulation for solid particle with the hydrodynamic gas phase will reduce the system to the two-fluid Eulerian model. On the other hand, in the collisionless regime for the solid particle, the free transport of solid particle will be followed in UGKWP, and coupled system will return to the Eulerian-Lagrangian formulation for the gas and particle. The scheme will be tested for in all flow regimes, which include the non-equilibrium particle trajectory crossing, the particle concentration under different Knudsen number, and the dispersion of particle flow with the variation of Stokes number. A experiment of shock-induced particle bed fluidization is simulated and the results are compared with experimental measu

关键词： Gases

First-principles study on the role of surface in the heavy fermion compound CeRh2Si2

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arXiv 2021年

作者： Wang, Yue-Chao Xu, Yuan-Ji Liu, Yu Han, Xing-Jie Zhu, Xie-Gang Yang, Yi-Feng Bi, Yan Liu, Hai-Feng Song, Hai-Feng Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing100190 China Science and Technology on Surface Physics and Chemistry Laboratory Sichuan Jiangyou621908 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China

In the heavy fermion materials, the characteristic energy scales of many exotic strongly correlated phenomena (Kondo effect, magnetic order, superconductivity, etc.) are at milli-electron-volt order, implying that the heavy fermion materials are surface sensitive. Here, we investigate the electronic structures for Si- and Ce-terminated surfaces of CeRh2Si2 by first-principles methods. Our research reveals three notable impacts of surface effects on electronic structures, which are consistent with recent angle-resolved photoemission spectroscopy (ARPES) experiments. Firstly, the relaxation of surface crystal structures changes the relative position of Fermi level, adjusts the dispersion of bands and enhances the Kondo resonance. Secondly, the decrease of the hybridization between the Ce-4f and conduction electrons in the surface layer leads to a weaker Kondo resonance peak and the shift of spin-orbit bands. Thirdly, the variation of crystal electric field around surface Ce atoms affects the splitting of Kondo resonance peaks, and also pushes down the lower-Hubbard bands of surface 4f electrons. Moreover, we find the characteristic of bulk's lower-Hubbard bands, which was overlooked in previous works. Our investigation suggests that these surface effects are potentially important and highlighted in the future researches on properties of strongly correlated materials. Copyright © 2021, The Authors. All rights reserved.

关键词： Electronic structure

Effects of Branching and Polydispersity on Thermal Conductivity of Paraffin Waxes

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SSRN

SSRN 2022年

作者： Boomstra, M.W. van Asseldonk, M.W.J. Geurts, B.J. Nazarychev, V.M. Lyulin, A.V. Soft Matter and Biological Physics Department of Applied Physics Eindhoven University of Technology P.O. Box 513 Eindhoven5600 MB Netherlands Center for Computational Energy Research P.O. Box 6336 Eindhoven5600 HH Netherlands Multiscale Modeling and Simulation Department of Applied Mathematics Faculty EEMCS University of Twente P.O. Box 217 Enschede 7500AE Netherlands Institute of Macromolecular Compounds Russian Academy of Sciences Bolshoi Prospect V.O. 31 St. Petersburg199004 Russia

Paraffin waxes are promising phase change materials, abundantly available at very low cost. Having large latent heat, these materials can be used for thermal energy storage. However, when used in heat batteries, paraffin’s low thermal conductivity prevents fast charging and discharging. This calls for the design of tailored hybrid materials with improved properties, the present study concentrates on properties of pure paraffin wax. Using fully atomistic molecular-dynamics (MD) simulations, we study the effects of polydispersity and branching on the thermal conductivity of paraffin waxes, in molten (450 K) and solid (250 K) state. Both branching and polydispersity affect the density and especially the crystallinity of the solid. Branching has a pronounced effect on crystallisation caused by inhibited alignment of the polymer backbones while the effect of polydispersity is less pronounced. The thermal conductivity (TC) has been simulated using the reverse non-equilibrium molecular-dynamics method, as well as the equilibrium Green-Kubo approach. Increased branching, added to backbones comprised of twenty monomers, results in decreasing TC of up to 30%, polydispersity only has an effect in the semi-crystalline state. Comparison to available experiments shows good agreement which validates the model details, applied force field and the calculation *** show that at comparable computational costs, the reverse non-equilibrium MD approach produces more reliable results for TC, as compared to the equilibrium Green-Kubo method. The major contribution to TC by acoustic phonon transport along the backbone was shown by analysing extreme cases. The phonon density of states (PDOS) of samples with high branching or with small chain length displayed diminished peaks in the acoustic range as compared to the PDOS of samples with low branching or larger chain length, respectively. The suggested MD approach can definitely be used to investigate specific material modifications aime

关键词： Phase change materials

Correction: Forecasting invasive mosquito abundance in the Basque Country, Spain using machine learning techniques

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Parasites & vectors 2025年第1期18卷 120页

作者： Vanessa Steindorf Hamna Mariyam K B Nico Stollenwerk Aitor Cevidanes Jesús F Barandika Patricia Vazquez Ana L García-Pérez Maíra Aguiar M3A Basque Center for Applied Mathematics Mazarredo 14 48009 Bilbao Bizkaia Spain. vsteindorf@***. M3A Basque Center for Applied Mathematics Mazarredo 14 48009 Bilbao Bizkaia Spain. Animal Health Department NEIKER-Basque Institute for Agricultural Research and Development Basque Research and Technology Alliance (BRTA) 48160 Derio Bizkaia Spain. acevidanes@neiker.eus. Animal Health Department NEIKER-Basque Institute for Agricultural Research and Development Basque Research and Technology Alliance (BRTA) 48160 Derio Bizkaia Spain. Ikerbasque Basque Foundation for Science 48009 Bilbao Bizkaia Spain.