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Coexistence of Robust Edge States and Superconductivity in Few-Layer Stanene

Physical Review Letters 2022年第20期128卷 206802-206802页

作者： Chenxiao Zhao Leiqiang Li Liying Zhang Jin Qin Hongyuan Chen Bing Xia Bo Yang Hao Zheng Shiyong Wang Canhua Liu Yaoyi Li Dandan Guan Ping Cui Zhenyu Zhang Jinfeng Jia Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China International Center for Quantum Design of Functional Materials (ICQD) Hefei National Laboratory for Physical Sciences at Microscale (HFNL) and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory for Special Functional Materials of Ministry of Education Collaborative Innovation Center of Nano Functional Materials and Applications School of Materials Science and Engineering Henan University Kaifeng 475004 China International Laboratory for Quantum Functional Materials of Henan and School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

High-quality stanene films have been actively pursued for realizing not only quantum spin Hall edge states without backscattering, but also intrinsic superconductivity, two central ingredients that may further endow the systems to host topological superconductivity. Yet to date, convincing evidence of topological edge states in stanene remains to be seen, let alone the coexistence of these two ingredients, owing to the bottleneck of growing high-quality stanene films. Here we fabricate one- to five-layer stanene films on the Bi(111) substrate and observe the robust edge states using scanning tunneling microscopy/spectroscopy. We also measure distinct superconducting gaps on different-layered stanene films. Our first-principles calculations further show that hydrogen passivation plays a decisive role as a surfactant in improving the quality of the stanene films, while the Bi substrate endows the films with nontrivial topology. The coexistence of nontrivial topology and intrinsic superconductivity renders the system a promising candidate to become the simplest topological superconductor based on a single-element system.

关键词： Growth Topological insulators Elemental superconductors Stanene Topological superconductors First-principles calculations Molecular beam epitaxy Scanning tunneling microscopy Scanning tunneling spectroscopy

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Development Research of the Double “L” Shaped Steel Plate-Concrete Composite Shear Wall

Development Research of the Double “L” Shaped Steel Plate-...

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作者： Wenhui He Yikun Wan Yuyu Li Lin Chen State Key Laboratory of Subtropical Building Science South China University of Technology College of Water Conservancy and Civil Engineering South China Agricultural University Guangdong Jianke Architectural Design Institute of Guangdong Province Co. Ltd

A double steel plates composite shear wall member composed of "L" elements(D-L-SCW) was proposed in this paper and its seismic behavior was preliminarily studied. With the shear-span ratio as test parameter, two specimens with actual ratio of 0.5 were constructed and tested in horizontal low-cycle reverse loading test. The failure modes, hysteretic behavior, skeleton curve, ductility and energy dissipation of the specimens were studied. Results showed that the suggested composite shear wall has significant seismic performance and can make more full use of the properties of both materials. The shear-span ratio mainly affected the peak load of the specimens, whilst it didn't affect the overall deformation trend.

关键词： Double "L" shaped steel plate development research composite shear wall horizontal low cycle reverse test

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Efficient purification of impurities from depleted uranium chips by hydrogen plasma arc melting

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Vacuum 2025年 240卷

作者： Yanhu Li Cun Hu Yuanfen Cheng Zhen Lei Hongya Li The 404 Company Limited China National Nuclear Corporation Jiayuguan 735100 China Chengdu Nuclear Engineering Design & Research Institute Co. Ltd. 404. CNNC Chengdu 610000 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

Recycling and utilization of depleted uranium (DU) chips is highly significant for the development of nuclear energy and environmental safety. In this paper, the removal of non-metallic and metallic impurities from DU chips by plasma arc melting with pure Ar (PAM) and H 2 -Ar mixture (HPAM) was examined, respectively. Experimental results demonstrate that HPAM exhibits a significantly superior impurity removal effect compared to PAM. Notably, the average removal degree of non-metallic impurities in DU chips using HPAM with a 20 % H 2 -Ar mixture gas for 30 min can reach 82.8 %, which is much higher than 10.9 % achieved by PAM. Meanwhile, average removal degree of metallic impurities increased from 37.9 % for PAM to 67.5 % for HPAM. Therefore, HPAM can rapidly and efficiently remove non-metallic and metallic impurities from DU chips, thereby promoting the recycling and reuse of DU materials, and providing a reliable guarantee for the development of nuclear energy and environmental safety.

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Scheme for automatic differentiation of complex loss functions with applications in quantum physics

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Physical Review E 2021年第1期103卷 013309-013309页

作者： Chu Guo Dario Poletti Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Science and Math Cluster and Engineering Product Development Singapore University of Technology and Design 8 Somapah Road 487372 Singapore

The past few years have seen a significant transfer of tools from machine learning to solve quantum physics problems. Automatic differentiation is one standard algorithm used to efficiently compute gradients of loss functions for generic neural networks. In this work we show how to extend automatic differentiation to the case of complex loss function in a way that can be readily implemented in existing frameworks and which is compatible with the common case of real loss functions. We then combine this tool with matrix product states and apply it to compute the ground state and the steady state of a close and an open quantum system. Compared to the traditional density matrix renormalization group algorithm, complex automatic differentiation allows both straightforward GPU accelerations as well as generalizations to different types of tensor and neural networks.

关键词： Density matrix methods Machine learning

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Rechargeable Aqueous Zinc-Ion Batteries in MgSO4/ZnSO4 Hybrid Electrolytes

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Nano-Micro Letters 2020年第5期12卷 33-48页

作者： Yingmeng Zhang Henan Li Shaozhuan Huang Shuang Fan Lingna Sun Bingbing Tian Fuming Chen Ye Wang Yumeng Shi Hui Ying Yang College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongPeople’s Republic of China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060People’s Republic of China Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province ShenzhenPeople’s Republic of China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060People’s Republic of China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore School of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou 510006People’s Republic of China Key Laboratory of Material Physics of Ministry of Education School of Physics and EngineeringZhengzhou UniversityZhengzhou 450052People’s Republic of China

MgSO4 is chosen as an additive to address the capacity fading issue in the rechargeable zinc-ion battery system of MgxV2O5·nH2O//ZnSO4//*** with different concentration ratios of ZnSO4 and MgSO4 are *** batteries measured in the 1 M ZnSO4^-1 M MgSO4 electrolyte outplay other competitors,which deliver a high specific capacity of 374 mAh g^-1 at a current density of 100 mA g^-1 and exhibit a competitive rate performance with the reversible capacity of 175 mAh g^-1 at 5 A g^-*** study provides a promising route to improve the performance of vanadium-based cathodes for aqueous zinc-ion batteries with electrolyte optimization in cost-effective electrolytes.

关键词： Aqueous zinc-ion batteries Hybrid electrolytes Electrolyte additives Magnesium ions Vanadates

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Groundwater resources survey of tongchuan city using the audio magnetotelluric method

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Applied Geophysics 2020年第5期17卷 660-671,900页

作者： Xu Zhi-min Tang Jing-tian Li Guang Xin Hui-Cui Xu Zhang-jian Tan Xin-ping LI Jin Heibei Instrument&Meter Engineering Technology Research Center Chengde Petroleum CollegeChengde 067000China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education(Central South University)Changsha 410083China Northwest Research Institution of Engineering Investigations and Design Xi’an 710003China School of Geophysics and Measurement-control Technology Nanchang 330013China College of Information Science and Engineering Hunan Normal UniversityChangsha 410081China

The development of Tongchuan City,Shaanxi Province,located in the northwestern region of China,is restricted by water *** direct current resistivity and induced polarization sounding methods are typically applied in finding urban *** methods,however,are not effective due to their complicated topography and geological *** application practice shows that the audio magnetotelluric(AMT)method has a large depth of exploration,high work effi ciency,and high lateral *** investigate the distribution of groundwater resources,we deployed three audio-frequency magnetotelluric profiles in the city *** impedance tensor information of AMT data is obtained using *** data dimension analysis reveals that the two-dimensional structural features of the observation area are *** main structure of the observation area is about 45°northeast,as indicated by structural trend analysis.A shallow two-dimensional electrical profile of 1 km in Tongchuan City is obtained by two-dimensional nonlinear conjugate gradient ***,combined with regional geological information,the geological structure characteristics reflected by the electrical profile were obtained along with the detailed characteristics of water-rich structures in the *** infl uence of the structure on the groundwater distribution was analyzed,and the water-rich areas were identifi *** work contributes to the prospective development of Tongchuan City.

关键词： urban geology audio magnetotelluric sounding method electrical structure groundwater resources

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Non-reciprocity of energy transfer derived from cubic stiffness-induced nonlinear phenomena

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Results in Physics 2025年 73卷

作者： Kong, Na Sun, Min Chen, Jianen Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin 300384 China School of Science Tianjin Chengjian University Tianjin 300384 China

Introducing purely nonlinear elastic elements can induce rich dynamic behaviors, such as bifurcations, jumps and isolated resonance curves, to linear systems. Therefore, these elements are suitable for constructing strong non-reciprocity of vibration energy transfer. First, the energy transfer along reciprocal directions in a three-degree-of-freedom system is investigated, where three oscillators are connected by cubic springs. The semi-analytical solutions of the system are obtained using the complexification-averaging method and the least squares method. The results are compared against numerical solutions obtained by the Runge-Kutta method. The excitation amplitude range that produces strong non-reciprocity of vibration energy is analyzed. The jump phenomenon under combined excitation is investigated, and a trigger method for constructing non-reciprocity using an impulse is proposed. Then, an oscillator chain with cubic stiffness and scaling parameters is embedded into a multi-degree-of-freedom linear oscillator system to further explore the effect of cubic stiffness. Energy transfer along two directions is compared by exciting the leftmost oscillator and the rightmost oscillator. Moreover, the trigger effect of the impulse on non-reciprocity is demonstrated. The results show significant differences in vibration energy transfer within three distinct frequency bands. The critical points between reciprocal and non-reciprocal states are obtained, and the three stages of reciprocity related to excitation amplitude are analyzed. Lastly, the modulation effect of the cubic stiffness on non-reciprocity is conducted by comparing the energy of the output oscillator. © 2025 The Authors

关键词： Cubic stiffness Energy transfer Jump phenomenon Non-reciprocity

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Microgroove convexity is critical for robust gaseous layers on hierarchically-structured superhydrophobic surfaces

arXiv

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arXiv 2021年

作者： Han, Xiao Liu, Jingnan Upmanyu, Moneesh Wang, Hailong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Anhui Hefei230027 China Department of Mechanical and Industrial Engineering Northeastern University BostonMA02115 United States

Gaseous layers (plastrons) trapped on the surfaces of immersed hydrophobic surfaces are critical for their function. Fibrillar morphologies offer a natural pathway, yet they are limited to a narrow range of liquid-surface systems and are vulnerable to pressure fluctuations that irreversibly destroy the plastron. Inspired by the convexly grooved surfaces of water fern (Salvinia) leaves that support their fibrous outgrowths, we study the plastron formation on 3D-printed dual-scale surfaces with elliptical interconnected microgrooves. The groove curvature stabilizes a seed gas layer (SGL) that facilitates plastron formation and restoration for all immersed hydrophobic surfaces. Computations and theoretical calculations reveal that the SGL storage capacity that sets the plastron robustness follows from the liquid menisci adaption to the groove geometry and pressure, and it can be further tuned using separated grooves. Our study highlights groove convexity as a key morphological feature for the design of multi-scale immersed surfaces for robust superhydrophobicity. © 2021, CC BY.

关键词： Hydrophobicity

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Effective reduction of matrix thermal conductivity through composite softening

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Newton 2025年第1期1卷

作者： Jiajing Huang James Patrick Male Yandong Sun Ramya Gurunathan Pochung Huang Gerald Jeffrey Snyder Yue Lin CAS Key Laboratory of Design and Assembly of Functional Nanostructures and State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China University of Chinese Academy of Sciences Beijing 100049 China Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg 20899 MD USA

Conventional wisdom suggests that incorporating high-thermal-conductivity nanomaterials, such as graphene and carbon nanotubes, can enhance the thermal conductivity of composite matrices. However, our study on graphene nanoplatelets (GNPs) within a lead telluride (PbTe) matrix, along with an extensive review of 18 composites, reveals that such additions can lead to a significant decrease in thermal conductivity. This reduction is attributed to a decrease in phonon velocity, as seen by measuring the sound velocity v s , which strongly impacts lattice thermal conductivity ( κ L ). For instance, a volume fraction of just 1.47% GNPs results in an 11.1% reduction in PbTe’s v s , cutting κ L by 29.7%. We introduce a dimensionless parameter, χ , derived from the contrasts in Young’s modulus and density between the composite constituents. This parameter allows for the prediction of the degree to which v s and, consequently, κ L are reduced, based on the mechanical properties of the composite components. Alongside interfacial phonon scattering, this research pivots the focus toward composite softening as a critical factor in manipulating thermal conductivity.

关键词： structure-properties relationship composites phenomenological model thermal conductivity graphene thermoelectrics

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Multiferroic van der Waals heterostructure FeCl2/Sc2CO2: Nonvolatile electrically switchable electronic and spintronic properties

arXiv

引用

arXiv 2022年

作者： Cao, Liemao Deng, Xiaohui Zhou, Guanghui Liang, Shi-Jun Nguyen, Chuong V. Ang, L.K. Ang, Yee Sin College of Physics and Electronic Engineering Hengyang Normal University Hengyang421002 China Department of Physics Key Laboratory for Low-Dimensional Structures and Quantum Manipulation Ministry of Education Hunan Normal University Changsha410081 China Deparment of Physics College of Sciences Shaoyang University Shaoyang422001 China National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Department of Materials Science and Engineering Le Quy Don Technical University Hanoi100000 Viet Nam Science Mathematics and Technology Singapore University of Technology and Design 8 Somapah Road 487372 Singapore

Multiferroic van der Waals (vdW) heterostrucutres offers an exciting route towards novel nanoelectronics and spintronics device technology. Here we investigate the electronic and transport properties of multiferroic vdW heterostructure composed of ferromagnetic FeCl2 monolayer and ferroelectric Sc2CO2 monolayer using first-principles density functional theory and quantum transport simulations. We show that FeCl2/Sc2CO2 heterostructure can be reversibly switched from semiconducting to half-metallic behavior by electrically modulating the ferroelectric polarization states of Sc2CO2. Intriguingly, the half-metallic phase exhibits a Type-III broken gap band alignment, which can be beneficial for tunnelling field-effect transistor application. We perform a quantum transport simulation, based on a proof-of-concept two-terminal nanodevice, to demonstrate all-electric-controlled valving effects uniquely enabled by the nonvolatile ferroelectric switching of the heterostructure. These findings unravels the potential of FeCl2/Sc2CO2 vdW heterostructures as a building block for designing a next generation of ultimately compact information processing, data storage and spintronics devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Van der Waals forces

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