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Rashba-like spin splitting around non-time-reversal-invariant momenta

Physical Review B 2023年第23期107卷 235138-235138页

作者： L. L. Tao Jiayu Li Yuntian Liu Xianjie Wang Yu Sui Bo Song M. Ye. Zhuravlev Qihang Liu School of Physics Harbin Institute of Technology Harbin 150001 China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China St. Petersburg State University St. Petersburg 190000 Russia

The ubiquitous Rashba spin splitting occurring around time-reversal-invariant momenta (TRIM) reflects the fundamental interplay between spin-orbit coupling (SOC) and crystalline symmetry. Unexpectedly, recent measurements reveal novel Rashba spin splitting around the momenta lacking time-reversal symmetry (non-TRIM), whose mechanism remains elusive. Here, we theoretically elucidate the microscopic origin of Rashba spin splitting around non-TRIM and identify the design principles for its appearance. Conventionally, a Zeeman-like spin splitting dominates around non-TRIM due to the broken time-reversal symmetry and diminishes the Rashba-like features. Our results show that the Bloch wave function with specific orbital representation at certain non-TRIM could eliminate the first-order SOC effect. As a result, the corresponding little group hosts a type of quasisymmetry that commutes with the dominating SOC Hamiltonian, leading to a tiny SOC gap and helical spin texture. Furthermore, such a quasi-symmetry-induced tiny gap could manifest large Berry curvature, which is desirable for various topological applications. Our work expands the concept of Rashba physics beyond the conventional TRIM scenario, paving an avenue for designing novel spin-splitting materials through the cooperation of symmetry and orbital engineering.

关键词： Crystal symmetry Rashba coupling Spin-orbit coupling Interfaces Density functional calculations

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Ultrathin, Lightweight, and Flexible CNT Buckypaper Enhanced Using MXenes for Electromagnetic Interference Shielding

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Nano-Micro Letters 2021年第4期13卷 208-220页

作者： Rongliang Yang Xuchun Gui Li Yao Qingmei Hu Leilei Yang Hao Zhang Yongtao Yao Hui Mei Zikang Tang State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Science and Technology on Thermostructural Composite Materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China Instrumental Analysis and Research Center(IARC) Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080People’s Republic of China Institute of Applied Physics and Materials Engineering University of MacaoTaipa 999078MacaoPeople’s Republic of China

Lightweight,flexibility,and low thickness are urgent requirements for next-generation high-performance electromagnetic interference(EMI)shielding materials for catering to the demand for smart and wearable electronic *** several efforts have focused on constructing porous and flexible conductive films or aerogels,few studies have achieved a balance in terms of density,thickness,flexibility,and EMI shielding effectiveness(SE).Herein,an ultrathin,lightweight,and flexible carbon nanotube(CNT)buckypaper enhanced using MXenes(Ti3C2Tx)for high-performance EMI shielding is synthesized through a facile electrophoretic deposition *** obtained Ti3C2Tx@CNT hybrid buckypaper exhibits an outstanding EMI SE of 60.5 dB in the X-band at 100μ*** hybrid buckypaper with an MXene content of 49.4 wt%exhibits an EMI SE of 50.4 dB in the X-band with a thickness of only 15μm,which is 105%higher than that of pristine CNT ***,an average specific SE value of 5.7×10^(4) dB cm^(2) g^(−1) is exhibited in the 5-μm hybrid ***,this assembly process proves promising for the construction of ultrathin,flexible,and high-performance EMI shielding films for application in electronic devices and wireless communications.

关键词： Carbon nanotube MXene Buckypaper Electromagnetic interference shielding

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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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Cohesive Contact Insight to Stick-Slip Mechanism of Flexible Film/Substrate Bilayer Structure

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SSRN 2024年

作者： Liu, Shouyao Wu, Jian He, Shixue Yuan, Xuebo Stupkiewicz, Stanislaw Wang, Youshan National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China Center for Rubber Composite Materials and Structures Harbin Institute of Technology Weihai264209 China Institute of Fundamental Technological Research Polish Academy of Sciences Warsaw02-106 Poland Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province Southwest Jiaotong University Chengdu610031 China

As the critical feature of the stick-slip for soft materials, the interfacial Schallmach waves of flexible composite structures are essential for smart tactile sensors to realize sliding perception. Herein, the stick-slip mechanisms of Polydimethylsiloxane film/substrate bilayer structures (PF/SBS) with three substrate stiffnesses regulated by porosities are investigated using in-situ testing and cohesive contact modeling methods. The microcontact stiffness inhomogeneity disrupts the continuity and synchronization of Schallmach waves and causes non-periodic fluctuations in contact force. The buckling phenomenon of the film structure marks the transition from stick to slip. During the Schallmach wave propagation, the mode mixity angle located at the left shoulder varies between 0° to 27°, and the rear of the contact zone varies between 0° to 2.8°. © 2024, The Authors. All rights reserved.

关键词： Stick-slip

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Comparison of ablative and compressive mechanical behavior of several PICA-like ablative materials

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science China(Technological sciences) 2020年第8期63卷 1478-1486页

作者： ZHANG Jun FANG GuoDong YANG LingWei LI Wei HONG ChangQing MENG SongHe National Key Laboratory of Science and Technology for Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

It is significant to compare the ablative and compressive mechanical behavior of different PICA-like materials in the engineering *** plasma wind tunnel ablation tests with high-entropy air and CO2 atmospheres,and compressive experiments in the ambient and 150℃,were conducted for three kinds of PICA-like materials(CF/PR-Si,CBCF/PR-SiOC and NQF/PR-Si composites).The traditional carbon/phenolic(C/PR)braided composites were also used for ***-like materials have the better thermal insulation than traditional C/PR composite,especially for CBCF/PR-SiOC *** ablation behavior of CF/PR-Si and CBCF/PR-SiOC PICA-like materials in the CO2 atmosphere can produce a large amount of SiO2 in the form of coatings,oxide layers and skeletons on the ablated surface,which are greatly different from that in the air *** compressive behavior of PICA-like material is greatly depended on the fiber fabrics,and exhibits the large discrete *** longer fiber in the PICA-like materials plays the role in maintaining the material integrity,while it may increase the thermal conductivity.

关键词： PICA-like material ablation property plasma wind tunnel compressive behavior

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Preparation of Brittle Ito Microstructures Using Laser-Induced Forward Transfer technology

SSRN

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SSRN 2024年

作者： Sun, Chunqiang Wang, Zhuochao Cao, Wenxin Gao, Gang Yang, Lei Han, Jie-Cai Zhu, Jiaqi National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450000 China Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Ministry of Education Harbin Institute of Technology Harbin150080 China

The performance of transparent conductive microstructures plays a significant role in determining the device efficiency. The fabrication of ITO microstructures on the flexible optoelectronic devices remains challenging because of the high-temperature processing requirements and brittleness of the ceramic material. This paper highlights a three-dimensional microfabrication technique that combines sacrificial layer etching and laser-induced transfer. By studying the donor material thickness and the laser energy density, control of the sacrificial layer transfer thrust was achieved to yield an optimal microstructure performance. Different shapes of ITO transparent conductive microstructures were fabricated on polydimethylsiloxane (PDMS) surfaces, demonstrating structural integrity, visible light transmittances >90%, and resistivities of ≤8×10−⁴ Ω·cm. Finite element analysis was employed to simulate the impact transfer of the donor material onto the receiving substrate, thereby elucidating the energy-absorbing protective role of the flexible PDMS layer. Effective control of the transfer force was identified as a crucial factor in achieving the successful transfer of brittle films. This high-precision and rapid array processing approach meets the demands of automated batch manufacturing, indicating its potential for use in patterned processing on flexible substrates, as an alternative to lithographic techniques. This technique could be applied in the preparation of electronic skins and flexible devices. Additionally, for the first time, a 3×3 pixel resistive array sensor was integrated on a Ag nanowires/PDMS surface, demonstrating array pressure-sensing capabilities at pressures of 0–80 kPa. This study represents a significant step towards the development of multifunctional flexible optoelectronic devices. © 2024, The Authors. All rights reserved.

关键词： Polydimethylsiloxane

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Superbroad-band actively tunable acoustic metamaterials driven from poly(ethylene terephthalate)/carbon nanotube nanocomposite membranes

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Nano Research 2021年第1期14卷 100-107页

作者： Ying Li Wen Ning Qingyu Peng Minglong Yang Dongyi Lei Siyao Guo Peng Liu Kaili Jiang Xiaodong He Yibin Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics&Tsinghua-Foxconn Nanotechnology Research CenterTsinghua University&Collaborative Innovation Center of Quantum MatterBeijing 100084China Shenzhen STRONG Advanced Materials Institute Ltd.Corp Shenzhen 518000China

Actively tunable acoustic metamaterials have attracted ever increasing ***,their tunable frequency range is quite narrow(tens of Hz)even under ultrahigh applied voltage(about 1,000 V).Here,we report a superbroad-band actively tunable acoustic metamaterials with the bandwidth over 400 Hz under a low *** the actively tunable acoustic metamaterials,the acoustic membrane is a laminated nanocomposite consisting of a poly(ethylene terephthalate)(PET)and super-aligned carbon nanotube(CNT)drawn from CN T forest *** laminated nanocomposite membrane exhibits adjustable acoustic properties,whose modulus can be adjusted by applying external electric *** maximum frequency bandwidth of PET/CN T nanocomposite membrane reaches 419 Hz when applying an external DC voltage of 60 *** actively tunable acoustic metamaterials with superbroad-band and lightweight show very promising foreground in noise reduction applications.

关键词： poly(ethylene terephthalate)/carbon nanotube nanocomposite membrane active control acoustic metamaterials noise reduction

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Hydrogel-elastomer-based stretchable strain sensor fabricated by a simple projection lithography method

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International Journal of Smart and Nano Materials 2021年第3期12卷 256-268页

作者： Zhenqing Li Xiangnan He Jianxiang Cheng Honggeng Li Yuan-Fang Zhang Xiaojuan Shi Kai Yu Hui Ying Yang Qi Ge Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenChina Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and TechnologyShenzhenChina Digital Manufacturing and Design Centre Singapore University of Technology and DesignSingapore Department of Mechanical Engineering University of Colorado DenverDenverCOUSA National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinP.R.China

Stretchable strain sensor detects a wide range of strain variation and is therefore a key component in various *** traditional ones made of elastomers doped with conductive components or fabricated with liquid conductors,ionically conductive hydrogel-based strain sensors remain conductive under large deformations and are ***,dehydration is a challenging issue for the *** have developed hydrogel-elastomer-based strain sensors where an elastomer matrix encapsulates a hydrogel circuit to prevent its ***,the reported multistep approaches are generally *** group recently reported a multimaterial 3D printing approach that enables fast fabrication of such sensors,yet requires a self-built digital-light-processing-based multimaterial 3D ***,we report a simple projection lithography method to fabricate hydrogel-elastomer-based stretchable strain sensors within 5 *** method only requires a UV projector/lamp with photomasks;the chemicals are commercially available;the protocols for preparing the polymer precursors are friendly to users without chemistry ***,the manufacturing flexibility allows users to readily pattern the sensor circuit and attach the sensor to a 3D printed soft pneumatic actuator to enable strain sensing on the *** proposed approach paves a simple and versatile way to fabricate hydrogel-elastomer-based stretchable strain sensors and flexible electronic devices.

关键词： Ionically conductive hydrogel stretchable strain sensor projection lithography

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Energizing the future:Empowering sustainability with Electron

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Electron 2023年第1期1卷 1-3页

作者： Jiecai Han Wei Huang Shu-Hong Yu Ning Gu Sean Li Hyunjoon Song Robert Palgrave Chenglin Yan National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina Frontiers Science Center for Flexible Electronics Institute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi'anChina Division of Nanomaterials&Chemistry Department of ChemistryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefeiChina Jiangsu Key Laboratory for Biomaterials and Devices School of Biological Science and Medical EngineeringSoutheast UniversityNanjingChina School of Materials Science and Engineering The University of New South WalesKensingtonNew South WalesAustralia Department of Chemistry and Center for Molecular Science Korea Advanced Institute of Science and TechnologyTaejonRepublic of Korea Department of Chemistry University College LondonLondonUK Collaborative Innovation Center of Suzhou Nano Science and Technology College of EnergySoochow UniversitySuzhouChina

The advent of industrial civilization has brought about enormous materials advancements;yet it has also caused a rapid depletion of natural resources,leading to global energy crisis and environmental *** human civilization,one fundamental issue stands at its core:how can we achieve a harmonious coexistence between humanity and nature?This question has become the key challenge of our time,demanding our utmost attention and concerted efforts.

关键词： pollution. civilization depletion

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Time-sequential color code division multiplexing holographic display with metasurface

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Opto-Electronic Advances 2023年第8期6卷 8-16页

作者： Xin Li Qinmiao Chen Xue Zhang Ruizhe Zhao Shumin Xiao Yongtian Wang Lingling Huang Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China MoE Key Laboratory of Photoelectronic Imaging Technology and System and MIIT Key Laboratory of Photonics Information TechnologySchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemHarbin Institute of Technology(Shenzhen)Shenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Color metasurface holograms are powerful and versatile platforms for modulating the amplitude,phase,polarization,and other properties of light at multiple operating ***,the current color metasurface holography can only realize static *** this study,we propose and demonstrate a multiplexing metasurface technique combined with multiwavelength code-division multiplexing(CDM)to realize dynamic *** code references are utilized to record information within a single metasurface and increase the information capacity and security for anticracks.A total of 48 monochrome images consisting of pure color characters and multilevel color video frames were reconstructed in dual polarization channels of the birefringent metasurface to exhibit high information density,and a video was displayed via sequential illumination of the corresponding code patterns to verify the ability of dynamic *** approach demonstrates significant application potential in optical data storage,optical encryption,multiwavelengthversatile diffractive optical elements,and stimulated emission depletion microscopy.

关键词： metasurface color holography dynamic display code division multiplexing

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