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Layer Hall Detection of the Néel Vector in Centrosymmetric Magnetoelectric Antiferromagnets

Physical Review Letters 2024年第9期133卷 096803页

作者： L. L. Tao Qin Zhang Huinan Li Hong Jian Zhao Xianjie Wang Bo Song Evgeny Y. Tsymbal Laurent Bellaiche School of Physics Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics International Center of Future Science National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience Smart Ferroic Materials Center Physics Department and Institute for Nanoscience and Engineering Department of Materials Science and Engineering Tel Aviv University Ramat Aviv Tel Aviv 6997801 Israel

The efficient detection of the Néel vector in antiferromagnets is one of the prerequisites toward antiferromagnetic spintronic devices and remains a challenging problem. Here, we propose that the layer Hall effect can be used to efficiently detect the Néel vector in centrosymmetric magnetoelectric antiferromagnets. Thanks to the robust surface magnetization of magnetoelectric antiferromagnets, the combination of sizable exchange field and an applied electric field results in the layer-locked spin-polarized band edges. Moreover, the Berry curvature can be engineered efficiently by an electric field, which consequently gives rise to the layer-locked Berry curvature responsible for the layer Hall effect. Importantly, it is demonstrated that the layer Hall conductivity strongly depends on the Néel vector orientation and exhibits rich electromagnetic responses, which can be used to detect the Néel vector reversal. Based on density functional theory calculations, we exemplify those phenomena in the prototypical Cr2O3 compound. A complete list of the magnetic point groups sustaining the layer Hall effect is presented, aiding the search for realistic materials. Our work proposes a novel approach to detect the Néel vector and holds great promise for antiferromagnetic spintronic applications.

关键词： Anomalous Hall effect Magnetoelectric effect Transport phenomena Antiferromagnets Multiferroics First-principles calculations k dot p method

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Polarization Multiplexing Graphene-Based Coding Metasurfaces For Flexible Wavefront Manipulation And Polarization of Terahertz Beam

SSRN

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SSRN 2023年

作者： He, Xunjun Lu, Jinliang Jiang, Jiuxing Yao, Yongtao Zhang, Ying School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin150080 China College of Science Harbin University of Science and Technology Heilongjiang150080 China National key laboratory of science and technology on advanced composites in special environments Harbin Institute of Technology Harbin150080 China

Recently, the wavefront control devices based on terahertz metasurfaces have drawn enormous attention in next-generation (6G) communication applications. Generally, these devices achieve dynamic wavefront control by integrating the metasurfaces with traditional active materials. However, most existing devices suffer from limitations such as single polarization mode of incident waves and intrinsic properties of the active materials, which hinder their developments and applications. To address these challenges, herein, we design graphene-based reflection coding metasurfaces for active wavefront control. The coding meta-atom is composed of a graphene split ring resonator, a dielectric layer, and a metal ground plate. Furthermore, by rotating the coding meta-atom, an independent 2π phase coverage may be obtained for CP or LP illuminations, enabling the polarization multiplexing. Based on the vortex phase profile, a proof-of-concept metasurface (MS-1) is constructed to generate different wavefront responses. By altering the polarization mode of incident waves and Fermi level of coding regions, these wavefronts can be actively switched between a vortex beam, multi-beam, and specular reflection beam. Additionally, according to the parabolic phase profile, another metasurface (MS-2) is developed to create a tunable metalens, allowing for active control over its focusing intensity and focal depth by adjusting the Fermi level of graphene. Therefore, these wavefront-controlled metasurfaces have high capacity and integration due to polarization multiplexing and active modulation, making them highly promising for potential applications in terahertz communications. © 2023, The Authors. All rights reserved.

关键词： Graphene

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A Thermo-Mechanical Numerical Model Accounting for the Viscous Effects of Polymeric Materials Under Hypervelocity Impact

SSRN

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SSRN 2023年

作者： Xu, Huadong Zhou, Jia Cao, Xu Miao, Changqing National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of Technology Harbin150001 China Harbin Institute of Technology China

In hypervelocity impact (HVI) events, the thermo-mechanical behavior of polymeric materials is significantly influenced by viscous effects, which in turn affects energy absorption and protective efficacy. A thermo-mechanical numerical model, which tailored to account for the viscous effects inherent in polymeric materials, was designed to simulate the mechanical behavior and heat generation of materials under HVI. An isotropic viscoelastic-viscoplastic constitutive equation and the Mie-Grüneisen equation of state (EOS) are applied to describe the deviatoric deformation and strongly nonlinear volumetric compression behavior. Moreover, the heat generation is calculated considering contributions of mechanical work (plastic work and viscous dissipation) and irreversible entropy increase, and the temperature increase is calculated based on the apparent heat capacity method. The model is seamlessly integrated into the LS-DYNA program through a user-defined material subroutine. Additionally, the FEM-SPH adaptive method is adopted to accurately model fragmentation which always accompanies in the HVI event, wherein the finite element method (FEM) handles contact and penetration behavior, while the smoothed particle hydrodynamics (SPH) method addresses the formation and motion of debris clouds. Ultra-high molecular weight polyethylene (UHMWPE) is selected as the sample material, and its model parameters are calibrated based on experimental data from dynamic compression testing. A variety of HVI simulations have been conducted and the results demonstrate that the key parameters are in close agreement with the experimental data from literature, such as the perforation diameter and the debris cloud tip velocity, revealing that the model could accurately predict the thermo-mechanical behavior of UHMWPE plates under HVI. An additional noteworthy facet is the capability of the model in capturing the temperature distribution and diverse energy components induced by the impact, inclu

关键词： Numerical models

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Production of Fibres from Lunar Soil:Feasibility,Applicability and Future Perspectives

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advanced Fiber Materials 2022年第5期4卷 923-937页

作者： Ze‑Shi Guo Dan Xing Xiong‑Yu Xi Xiu Yue Cun‑Guang Liang Bin Hao Qingbin Zheng Sergey I.Gutnikov Bogdan I.Lazoryak Peng‑Cheng Ma Laboratory of Environmental Science and Technology The Xinjiang Technical Institute of Physics and ChemistryKey Laboratory of Functional Materials and Devices for Special EnvironmentsChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China Chemistry Department Lomonosov Moscow State University119991 MoscowRussia

The construction of a lunar base is considered to be an important step towards deep-space exploration by humanity,and will rely on the utilisation of in situ lunar *** this paper,we discuss the current knowledge on the feasibility of converting lunar soil to high-performance fibres that can be used for the construction of a lunar *** fibre would be combined with further portions of lunar soil to generate fibre-reinforced composites,which is utilized as multi-functional materials for lunar base *** discuss and analyse the latest findings regarding the composition of lunar soil simulants and their fibrisation properties,and techniques for fibre spinning and system ***,we suggest how the achievements made so far could be applied to the construction of a lunar base.

关键词： Lunar soil Lunar fibre In-situ resource utilization Construction of lunar base

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Strong convergence of the adaptive Milstein method for nonlinear stochastic differential equations with piecewise continuous arguments

arXiv

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arXiv 2025年

作者： Zhang, Yuhang Song, Minghui Zhu, Jiaqi School of Astronautics Harbin Institute of Technology Harbin150080 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450000 China School of Mathematics Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

In this work, an adaptive time-stepping Milstein method is constructed for stochastic differential equations with piecewise continuous arguments (SDEPCAs), where the drift is one-sided Lipschitz continuous and the diffusion does not impose the commutativity condition. It is widely recognized that explicit Euler or Milstein methods may blow up when the system exhibits superlinear growth, and modifications are needed. Hence we propose an adaptive variant to deal with the case of superlinear growth drift coefficient. To the best of our knowledge, this is the first work to develop a numerical method with variable step sizes for nonlinear SDEPCAs. It is proven that the adaptive Milstein method is strongly convergent in the sense of Lp, p ≥ 2, and the convergence rate is optimal, which is consistent with the order of the explicit Milstein scheme with globally Lipschitz coefficients. Finally, several numerical experiments are presented to support the theoretical analysis. Copyright © 2025, The Authors. All rights reserved.

关键词： Stochastic systems

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Modified radius-weighted lattice Boltzmann model to address singularities in axisymmetric multiphase flows

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Physical Review E 2022年第2期106卷 025316-025316页

作者： Xingchun Xu Yanwei Hu Yurong He Jiecai Han Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China School of Energy Science & Engineering Harbin Institute of Technology Harbin 150001 China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin 150080 China

The radius-weighted lattice Boltzmann model has achieved great success in the simulation of axisymmetric flows. However, severe spurious currents near the axis are observed when this model is extended to simulate axisymmetric multiphase flows. In this study, to determine the origin of this singularity, we conducted a truncation error analysis based on high-order Taylor series expansion and identified the leading error terms through dimensionless analysis. By neglecting the error terms in proportion to the radius, we obtained the final forms of the singular terms in the axisymmetric lattice Boltzmann model. We proposed a modified model by including an additional correction term, to remove the singularity at the third order. We validated the proposed model using numerical tests for flat and spherical interfaces. Results showed that the present modified model reduced the spurious currents near the axis by two orders of magnitude compared with the original model. This modified model also has been successfully applied to predict bubble dynamics in an air-water system. Our numerical results are in excellent agreement with available experimental observations in terms of bubble shapes and terminal velocities.

关键词： Multiphase flows Lattice-Boltzmann methods Navier-Stokes equation

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Ultralow Interfacial Thermal Resistance of Graphene Thermal Interface Materials with Surface Metal Liquefaction

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Nano-Micro Letters 2023年第1期15卷 183-196页

作者： Wen Dai Xing-Jie Ren Qingwei Yan Shengding Wang Mingyang Yang Le Lv Junfeng Ying Lu Chen Peidi Tao Liwen Sun Chen Xue Jinhong Yu Chengyi Song Kazuhito Nishimura Nan Jiang Cheng-Te Lin Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo 315201People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Institute of Advanced Technology Shandong UniversityJinan 250100People’s Republic of China Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of SciencesNingbo 315201People’s Republic of China The State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University800 Dong Chuan RoadShanghai 200240People’s Republic of China Advanced Nano-Processing Engineering Lab Mechanical Systems EngineeringKogakuin UniversityTokyo 192-0015Japan

Developing advanced thermal interface materials(TIMs)to bridge heat-generating chip and heat sink for constructing an efficient heat transfer interface is the key technology to solve the thermal management issue of high-power semiconductor *** on the ultra-high basal-plane thermal conductivity,graphene is an ideal candidate for preparing high-performance TIMs,preferably to form a vertically aligned structure so that the basal-plane of graphene is consistent with the heat transfer direction of ***,the actual interfacial heat transfer efficiency of currently reported vertically aligned graphene TIMs is far from *** addition to the fact that the thermal conductivity of the vertically aligned TIMs can be further improved,another critical factor is the limited actual contact area leading to relatively high contact thermal resistance(20-30 K mm^(2) W^(−1))of the“solid-solid”mating interface formed by the vertical graphene and the rough chip/heat *** solve this common problem faced by vertically aligned graphene,in this work,we combined mechanical orientation and surface modification strategy to construct a three-tiered TIM composed of mainly vertically aligned graphene in the middle and micrometer-thick liquid metal as a cap layer on upper and lower *** on rational graphene orientation regulation in the middle tier,the resultant graphene-based TIM exhibited an ultra-high thermal conductivity of 176 W m^(−1) K^(−1).Additionally,we demonstrated that the liquid metal cap layer in contact with the chip/heat sink forms a“liquid-solid”mating interface,significantly increasing the effective heat transfer area and giving a low contact thermal con-ductivity of 4-6 K mm^(2) W^(−1) under packaging *** finding provides valuable guidance for the design of high-performance TIMs based on two-dimensional materials and improves the possibility of their practical application in electronic thermal management.

关键词： Vertically aligned graphene Liquid metal Surface modification Thermal interface materials

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Growth of Dispersed Nanodiamonds Via Vapor Phase Nucleation by Microwave Plasma Assisted Chemical Vapor Deposition

SSRN

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SSRN 2023年

作者： Liang, Ying Liu, Kang Liu, Benjian Li, Yicun Fan, Saifei Dai, Bing Zhang, Yumin Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin150080 China of Unmanned Equipment & Al Zhongshan528400 China

Microwave plasma assisted chemical vapor deposition (MPCVD) is a technique for preparing high-quality diamonds. However, the low yield and easy bonding between particles to form films are drawbacks that in the preparation of nano-diamond (ND) particles. These issues are believed to be mainly caused by the adverse factors of substrate nucleation and continuous growth of particles. In this study, to inhibit these factors, diamond vapor phase nucleation (VPN) - growth plasma environment is achieved by adjusting the spatial distribution of the carbon and hydrogen groups in plasma. In this environment, NDs nucleate without using a seeded substrate, grow and fall on the disk isolated from its nucleation and growth environment. The dispersed particle density breaks through the highest value of the conventional theory of MPCVD NDs deposition by 2 orders of magnitude (~ 1010cm−2). Besides, we further analyzed and improved the VPN growth mechanism. This study opens up a new mode of using MPCVD, which can be used to grow dispersed NDs. The development and improvement of this method is expected to provide higher quality NDs for fine grinding, composite material reinforcement, and color center applications. © 2023, The Authors. All rights reserved.

关键词： Nucleation

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Programming an efficient technique for designing smart C-doped MIC with dual self-protection forinformation and high-energy

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Rare Metals 2024年第12期43卷 6694-6703页

作者： Xiao-Gang Guo Tao-Tao Liang Hui-Sheng Huang Bin-Fang Yuan Fu-Lan Zhang Yi-Huang Chen Lu Liu Xun Cui Chongqing Key Laboratory of Inorganic Special Functional Materials College of Chemistry and Chemical EngineeringYangtze Normal UniversityChongqing408100China Department of Orthopedic Surgery Chongqing Sports Medicine CenterSouthwest HospitalThe Third Military Medical UniversityChongqing400038China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and ResearchSingapore627833Singapore State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan430200China

Constructing self-protected metastable intermolecular composites(MICs) enables the regulation of microstructures towards boosting controllable detonation performance,and also prevents information leakage,which is meaningful but ***,a convenient and efficient method of combining highly-controlled electrophoretic assembly,surface modification and microwave heat treatment was employed to design promising heattriggered wettability switchable high-energy smart C-doped Al/Cr_(2)O_(3)MIC,and surface modification mechanism was proposed,*** anti-wetting ability of the product was demonstrated by a series of tests of water contact angle,impact resistance,immersion,selfcleaning,*** key information recording/encryption procedures were realized by constructing a hydrophilic/hydrophobic interface and adjusting the wettability of the *** addition,the output heat of asobtained smart MIC can reach ~1.5 kJ·g^(-1),and its attenuation rate was only ~30% even after underwater aging,further verifying its potential ***,our design provides a promising strategy for engineering smart MIC with diversified functional structures for blasting applications and beyond.

关键词： High-energy MIC Information self-protection Exothermicity Stability

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Formation Mechanism of Nanoparticles in Fe-Cr-Al ODS Alloy Fabricated by Direct Oxidation Method

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 963-972页

作者： Fuzhao Yan Jing Li Yiyi Li Liangyin Xiong Shi Liu Materials for Special Environments Division CAS Key Laboratory of Nuclear Materials and Safety AssessmentShi-changxu Innovation Center for Advanced MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

This study presents the fabrication of 14CrFe-Cr-Al oxide dispersion strengthened(ODS)alloy by a direct oxidation *** order to explain how oxide nanoparticles are formed in the consolidation process,the powders after oxidation are subjected to vacuum thermal treatment at high *** scanning calorimeter,X-ray photoelectron spectroscopy,scanning electron microscopy and transmission electron microscopy techniques are used to detect the generation,evolution of oxides on both the surface and interior of the powder,as well as the type of oxide nanoparticles in the fabricated ODS *** is found that an iron oxide layer is formed on the surface of the powder during low temperature *** the iron oxide layer would be decomposed after thermal treatment at high *** the consolidation process,the oxygen required by the reaction of alumina and yttrium oxide to produce nano scale Y-Al-O particles mainly derives from the decomposition of iron oxide layer at elevated temperature and the inward diffusion of *** the direct oxidation process,YAlO_(3) nanoparticles are dispersed in the grains and at the grain boundaries of Fe-Cr-Al ODS alloy.

关键词： Fe-Cr-Al ODS alloy Direct oxidation Iron oxide layer Y-Al-O nanoparticles Formation mechanism

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