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Bethe ansatz solutions of the 1D extended Hubbard-model

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Communications in Theoretical physics 2024年第4期76卷 43-50页

作者：侯海洋孙佩乔艺许小甜张鑫杨涛 Institute of Modern physics Northwest UniversityXian 710127China Shaanxi Key laboratory for Theoretical physics Frontiers Xian 710127China beijing national laboratory for condensed matter Institute of physics Chinese Academy of SciencesBeijing 100190China

We construct an integrable 1D extended Hubbard model within the framework of the quantum inverse scattering *** the help of the nested algebraic Bethe ansatz method,the eigenvalue Hamiltonian problem is solved by a se... 详细信息

关键词： quantum integrable system Bethe ansatz T-Q relation Hubbard model

Interface and mechanical degradation mechanisms of the silicon anode in sulfide-based solid-state batteries at high temperatures

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Chinese physics B 2024年第8期33卷 117-126页

作者：王秋辰黄昱力许晶禹习谦李泓陈立泉 Key laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101408China

Silicon(Si)is a competitive anode material owing to its high theoretical capacity and low electrochemical ***,the prospect of Si anodes in solid-state batteries(SSBs)has been proposed due to less solid electrolyte interphase(SEI)formation and particle ***,major challenges arise for Si anodes in SSBs at elevated *** this work,the failure mechanisms of Si-Li_(6)PS_(5)Cl(LPSC)composite anodes above 80℃are thoroughly investigated from the perspectives of interface stability and(electro)chemo-mechanical *** chemistry and growth kinetics of Lix Si|LPSC interphase are demonstrated by combining electrochemical,chemical and computational *** and/or Si–P compound formed at Lix Si|LPSC interface prove to be detrimental to interface stability at high *** the other hand,excessive volume expansion and local stress caused by Si lithiation at high temperatures damage the mechanical structure of Si-LPSC composite *** work elucidates the behavior and failure mechanisms of Si-based anodes in SSBs at high temperatures and provides insights into upgrading Si-based anodes for application in SSBs.

关键词： sulfide electrolytes silicon anodes interface stability degradation kinetics all-solid-state batteries

Surface encapsulation of layered oxide cathode material with NiTiO_(3) for enhanced cycling stability of Na-ion batteries

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Chinese physics B 2024年第8期33卷 551-558页

作者：胡紫霖唐彬林挺张楚牛耀申刘渊高立克谢飞容晓晖陆雅翔胡勇胜 Key laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Yangtze River Delta physics Research Center Co.Ltd Liyang 213300China beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100049China Guangxi Power Grid Co.Ltd. Nanning 530023China

In Na-ion batteries,O3-type layered oxide cathode materials encounter challenges such as particle cracking,oxygen loss,electrolyte side reactions,and multi-phase transitions during the charge/discharge *** study focuses on surface coating with NiTiO_(3) achieved via secondary heat treatment using a coating precursor and the surface *** in-situ x-ray diffraction(XRD)and differential electrochemical mass spectrometry(DEMS),along with crystal structure characterizations of post-cycling materials,it was determined that the NiTiO_(3) coating layer facilitates the formation of a stable lattice structure,effectively inhibiting lattice oxygen loss and reducing side reaction with the *** enhancement in cycling stability was evidenced by a capacity retention of approximately 74%over 300 cycles at 1 C,marking a significant 30%improvement over the initial ***,notable advancements in rate performance were *** results indicate that a stable and robust surface structure substantially enhances the overall stability of the bulk phase,presenting a novel approach for designing layered oxide cathodes with higher energy density.

关键词： Na-ion battery layered oxides high voltage surface coating

High energy density in ultra-thick and flexible electrodes enabled by designed conductive agent/binder composite

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Journal of Energy Chemistry 2024年第3期90卷 133-143,I0005页

作者： Xiaoyu Shen Hailong Yu Liubin Ben Wenwu Zhao Qiyu Wang Guanjun Cen Ronghan Qiao Yida Wu Xuejie Huang beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials laboratory Dongguan 523808Guangdong China

Thick electrodes can increase incorporation of active electrode materials by diminishing the proportion of inactive constituents,improving the overall energy density of ***,thick electrodes fabricated using the conventional slurry casting approach frequently exhibit an exacerbated accumulation of carbon additives and binders on their surfaces,invariably leading to compromised electrochemical *** this study,we introduce a designed conductive agent/binder composite synthesized from carbon nanotube and *** agent/binder composite facilitates production of dry-process-prepared ultra-thick electrodes endowed with a three-dimensional and uniformly distributed percolative architecture,ensuring superior electronic conductivity and remarkable mechanical *** this approach,ultra-thick LiCoO_(2)(LCO) electrodes demonstrated superior cycling performance and rate capabilities,registering an impressive loading capacity of up to 101.4 mg/cm^(2),signifying a 242% increase in battery energy *** another analytical endeavor,time-of-flight secondary ion mass spectroscopy was used to clarify the distribution of cathode electrolyte interphase(CEI) in cycled LCO *** results provide unprecedented evidence explaining the intricate correlation between CEI generation and carbon distribution,highlighting the intrinsic advantages of the proposed dry-process approach in fine-tu ning the CEI,with excellent cycling performance in batteries equipped with ultra-thick electrodes.

关键词： Conductive agent/binder composite Dry process Ultra-thick electrodes High energy density CEI reconstruction ToF-SIMS

Optical-Microwave Entanglement Paves the Way for Distributed Quantum Computation

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Chinese physics Letters 2024年第1期41卷 21-24页

作者：胡志刚许凯张玉祥李贝贝 beijing national laboratory for condensed matter physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials laboratory Dongguan 523808China

Over the past few years,quantum computation based on superconducting circuits has achieved remarkable progress.A milestone occurred in 2019 when Google released Sycamore,a processor with 54 qubits,and claimed quantum supremacy by performing in just 100 s a specific computation which would take a classical supercomputer,as stated by Google’s team,10000 years to complete.[1]In 2021,a strong quantum advantage was demonstrated by Pan and his colleagues from the University of Science and Technology of China,using a quantum processor named Zuchongzhi,which has 66 functional qubits.[2]This year,the record of the number of quantum qubits has been lifted to 127 qubits.[3]Indeed,the number of qubits is limited to a few hundreds due to the finite space of dilution refrigerators,where the superconducting qubits must be placed to be isolated from thermal ***,this number is still several orders of magnitude away from the requirement of quantum error correction,which is essential for general-purpose quantum computers.[4–8].

关键词： quantum stated correction

FPGA and computer-vision-based atom tracking technology for scanning probe microscopy

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Chinese physics B 2024年第5期33卷 76-85页

作者：俞风度刘利王肃珂张新彪雷乐黄远志马瑞松郇庆 beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China ACME (beijing) Technology Co. Ltd.Beijing 101407China Key laboratory for Vacuum physics University of Chinese Academy of SciencesBeijing 100190China

Atom tracking technology enhanced with innovative algorithms has been implemented in this study,utilizing a comprehensive suite of controllers and software independently developed *** an on-board field-programmable gate array(FPGA)with a core frequency of 100 MHz,our system facilitates reading and writing operations across 16 channels,performing discrete incremental proportional-integral-derivative(PID)calculations within 3.4 *** upon this foundation,gradient and extremum algorithms are further integrated,incorporating circular and spiral scanning modes with a horizontal movement accuracy of 0.38 *** integration enhances the real-time performance and significantly increases the accuracy of atom *** tracking achieves an equivalent precision of at least 142 pm on a highly oriented pyrolytic graphite(HOPG)surface under room temperature atmospheric *** applying computer vision and image processing algorithms,atom tracking can be used when scanning a large *** techniques primarily consist of two algorithms:the region of interest(ROI)-based feature matching algorithm,which achieves 97.92%accuracy,and the feature description-based matching algorithm,with an impressive 99.99%*** implementation approaches have been tested for scanner drift measurements,and these technologies are scalable and applicable in various domains of scanning probe microscopy with broad application prospects in the field of nanoengineering.

关键词： atom tracking FPGA computer vision drift measurement

Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_(1-x)Ta_(x))_(3)Sb_(5) with enhanced superconductivity

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Chinese physics B 2024年第7期33卷 9-14页

作者：赵振王汝文张宇航祝轲余维琪韩烨超刘家利胡国静郭辉林晓董晓莉陈辉杨海涛高鸿钧 beijing national Center for condensed matter physics and Institute of physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials laboratory Dongguan 523808China

The kagome superconductor CsV_(3)Sb_(5) has attracted widespread attention due to its rich correlated electron states including superconductivity, charge density wave(CDW), nematicity, and pair density wave. Notably, the modulation of the intertwined electronic orders by the chemical doping is significant to illuminate the cooperation/competition between multiple phases in kagome superconductors. In this study, we have synthesized a series of tantalum-substituted Cs(V_(1-x)Ta_(x))_(3)Sb_(5) by a modified self-flux method. Electrical transport measurements reveal that CDW is suppressed gradually and becomes undetectable as the doping content of x is over 0.07. Concurrently, the superconductivity is enhanced monotonically from T_(c) ~ 2.8 K at x = 0 to 5.2 K at x = 0.12. Intriguingly, in the absence of CDW, Cs(V_(1-x)Ta_(x))_(3)Sb_(5)(x = 0.12) crystals exhibit a pronounced two-fold symmetry of the in-plane angular-dependent magnetoresistance(AMR) in the superconducting state, indicating the anisotropic superconducting properties in the Cs(V_(1-x)Ta_(x))_(3)Sb_(5). Our findings demonstrate that Cs(V_(1-x)Ta_(x))_(3)Sb_(5) with the non-trivial band topology is an excellent platform to explore the superconductivity mechanism and intertwined electronic orders in quantum materials.

关键词： kagome superconductor charge density wave rotation symmetry breaking

High-performance terahertz modulators induced by substrate field in Te-based all-2D heterojunctions

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Light(Science & Applications) 2024年第3期13卷 577-586页

作者： Pujing Zhang Qihang Liang Qingli Zhou Jinyu Chen Menglei Li Yuwang Deng Wanlin Liang Liangliang Zhang Qinghua Zhang Lin Gu Chen Ge Kui-juan Jin Cunlin Zhang Guozhen Yang Department of physics Key Laboratory of Terahertz OptoelectronicsMinistry of Educationand Beijing Advanced Innovation Center for Imaging Theory and TechnologyCapital Normal UniversityBeijing 100048China beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Materials Science and Engineering Beijing National Center for Electron Microscopy and Laboratory of Advanced MaterialsTsinghua UniversityBeijing 100084China

High-performance active terahertz modulators as the indispensable core components are of great importance for the next generation communication ***,they currently suffer from the tradeoff between modulation depth and ***,we introduce two-dimensional(2D)tellurium(Te)nanofilms with the unique structure as a new class of optically controlled terahertz modulators and demonstrate their integrated heterojunctions can successfully improve the device performances to the optimal and applicable levels among the existing all-2D broadband *** photoresponse measurements confirm the significant impact of the stacking *** first clarify the direction of the substrate-induced electric field through first-principles calculations and uncover the unusual interaction mechanism in the photoexcited carrier dynamics associated with the charge transfer and interlayer exciton *** advances the fundamental and applicative research of Te nanomaterials in high-performance terahertz optoelectronics.

关键词： performance field terahertz

Quantum confinement of carriers in the type-I quantum wells structure

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Chinese physics B 2024年第9期33卷 553-558页

作者： Xinxin Li Zhen Deng Yang Jiang Chunhua Du Haiqiang Jia Wenxin Wang Hong Chen Key laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials andDevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChineseAcademy of SciencesBeijing 100190China Center of Materials and Optoelectronics Engineering University of Chinese Academy ofSciencesBeijing 100049China The Yangtze River Delta physics Research Center Liyang 213000China Songshan Lake Materials laboratory Dongguan 523808China

Quantum confinement is recognized to be an inherent property in low-dimensional ***,it is believed that the carriers trapped within the well cannot escape due to the discrete energy ***,our previous research has revealed efficient carrier escape in low-dimensional structures,contradicting this conventional *** this study,we review the energy band structure of quantum wells along the growth direction considering it as a superposition of the bulk material dispersion and quantization energy dispersion resulting from the quantum confinement across the whole Brillouin *** accounting for all wave vectors,we obtain a certain distribution of carrier energy at each quantized energy level,giving rise to the energy *** results enable carriers to escape from the well under the influence of an electric ***,we have compiled a comprehensive summary of various energy band scenarios in quantum well structures relevant to carrier *** a new interpretation holds significant value in deepening our comprehension of low-dimensional energy bands,discovering new physical phenomena,and designing novel devices with superior performance.

关键词： energy band quantum confinement type-I quantum wells low-dimensional structures