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Anomalous open orbits in Hofstadter spectrum of Chern insulator

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 139-144页

作者： Haijiao Ji Peng Zhou Noah F.Q.Yuan Hua Jiang Haiwen Liu X.C.Xie center for Advanced quantum Studies Department of PhysicsBeijing Normal UniversityBeijing100875China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai201210China Department of Mathematics UC BerkeleyBerkeley94720USA Institute for Nanoelectronic devices and quantum Computing Fudan UniversityShanghai200433China International center for quantum materials School of PhysicsPeking UniversityBeijing100871China Hefei National Laboratory Hefei230088China

The nontrivial band topology of Chern insulator can enrich the content of its Hofstadter butterfly spectra,which is closely related to recent experiments in twisted bilayer graphene and cold atom *** investigate the Hofstadter spectrum for various models of Chern insulators under a rational fluxφ_(0)/q,hereφ_(0)=h/e and q being an *** find the number of splitting subbands is|q-C|with C denoting the Chern number of parent ***,anomalous open-orbital subbands with Chern numbers q-1 and-q-1 emerge unexpectedly,which are beyond the parameter window(-q/2,q/2)of the Diophantine equation studied by Thouless-Kohmoto-Nightingale-den Nijs[***.49,405(1982)].The emergence of anomalous open orbits can be traced by analyzing the evolution of the Hofstadter spectrum,identifying as a new type of topological phase *** novel findings not only pinpoint the peculiar Hofstadter spectrum of Chern insulator,but also provide routes to study exotic characteristics beyond the Landau level physics.

关键词： Hofstadter spectrum topological phase transition open orbit

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quantum dots enhanced stability of in-situ fabricated perovskite nanocrystals based light-emitting diodes:Electrical field distribution effects

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Fundamental Research 2025年第1期5卷 347-353页

作者： Xulan Xue Menglin Li Zhenjie Liu Chenhui Wang Jincheng Xu Shuangpeng Wang Hanzhuang Zhang Haizheng Zhong Wenyu Ji Key Lab of physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012China MIIT Key Laboratory for Low-Dimensional quantum Structure and devices School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Applied physics and materials Engineering University of MacaoTaipa 999078China

With the development in fabricating efficient perovskite light emitting diodes(PeLEDs),improving the operating stability becomes an urgent *** we report quantum dot(QD)enhanced stability of PeLEDs by introducing CdSe/ZnS core-shell QDs in toluene anti-solvent during in-situ fabrication of FAPbBr3 perovskite nanocrystals(PNCs)*** comparison with PNC films with pristine toluene as the anti-solvent,the as-prepared FAPbBr3 PNC films with a QD monolayer on the surface exhibit improved photoluminescence quantum yield,enhanced photostability and better *** from these advantages,the peak luminance and the maximum external quantum efficiency of the PeLED containing QD monolayer are increased from 6807 cd/m^(2)to 86,670 cd/m^(2)and 2.4%to 7.1%,*** T50 lifetime under the initial luminance of 1021 cd/m^(2)approaches 83 *** on electrical field simulation and transient electroluminescence measurements,the enhanced stability can be mainly attributed to the electrical field redistribution induced by the QD *** work demonstrates that the combination of QDs and perovskites provides an effective strategy to address the operational stability of *** insights into electrical field distribution effect will make great impact on stability improvement of other perovskite based devices.

关键词： Perovskite nanocrystals quantum dots Electrical field distribution Light-emitting diodes Operational stability

Edge supercurrent in Josephson junctions based on topological materials

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 1-12页

作者： Junjie Qi Chui-Zhen Chen Juntao Song Jie Liu Ke He Qing-Feng Sun X.C.Xie Beijing Academy of quantum Information Sciences Beijing 100193China School of Physical Science and Technology Soochow UniversitySuzhou 215006China Institute for Advanced Study Soochow UniversitySuzhou 215006China college of physics and Hebei Advanced Thin Films Laboratory Hebei Normal UniversityShijiazhuang 050024China School of physics Xi’an Jiaotong UniversityMinistry of Education Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed MatterXi’an 710049China State Key Laboratory of Low Dimensional quantum physics Department of PhysicsTsinghua UniversityBeijing 100084China Frontier Science center for quantum Information Beijing 100084China Hefei National Laboratory Hefei 230088China International center for quantum materials School of PhysicsPeking UniversityBeijing 100871China Interdisciplinary center for Theoretical physics and Information Sciences Fudan UniversityShanghai 200433China

The interplay between novel topological states and superconductivity has garnered substantial interest due to its potential for topological quantum *** Josephson effect serves as a useful probe for edge superconductivity in these hybrid topological *** Josephson junctions based on topological materials,supercurrents exhibit unique quantum interference patterns,including the conventional Fraunhofer oscillations,theΦ_(0)-periodic oscillation,and the 2Φ_(0)-periodic oscillation in response to the external magnetic field(Φ_(0)=h/2e is the flux quantum,h the Planck constant,and e the electron charge).These interference patterns stem from varied Andreev reflection mechanisms and the associated current density *** review seeks to comprehensively examine the theoretical and experimental advancements in understanding the quantum interference patterns of edge supercurrents in Josephson junctions based on quantum spin Hall,quantum Hall,and quantum anomalous Hall systems.

关键词： quantum Hall effect quantum spin Hall effect quantum anomalous Hall effect Josephson junction edge supercurrent Andreev reflection

Five-user quantum virtual local area network with an AlGaAs entangled photon source

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 61-73页

作者： Cheng Qian Hongkai Tian Xu Jing Yichen Liu Zhe Chen Huiran Luo Yuan Du Xiaodong Zheng Tangsheng Chen Yuechan Kong Hua-Lei Yin Dong Jiang Bin Niu Liangliang Lu Key Laboratory of State Manipulation and Advanced materials in Provincial Universities School of Physical Science and TechnologyNanjing Normal UniversityNanjing210023China School of Internet Anhui UniversityHefei230039China National Key Laboratory of Solid-State Microwave devices and Circuits Nanjing Chip Valley Industrial Technology InstituteNanjing Electronic Devices InstituteNanjing210016China Research center for quantum Optics and quantum Communication School of ScienceQingdao University of TechnologyQingdao266520China Department of physics and Beijing Key Laboratory of Opto-electronic Functional materials and Micro-nano devices Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education)Renmin University of ChinaBeijing100872China Beijing Academy of quantum Information Sciences Beijing100193China National Engineering Research center of Agro-Ecological Big Data Analysis and Application Anhui UniversityHefei230601China National Laboratory of Solid-State Microstructures and School of physics Nanjing UniversityNanjing210093China Hefei National Laboratory Hefei230088China

The promotion of quantum network applications demands the scalable connection of quantum *** is preferable to set up multiple logical networks coexisting on a single physical network infrastructure to accommodate a larger number of *** we present a quantum virtual network architecture that offers this level of scalability,without being constrained to a fixed physical-layer network relying solely on passive multiplexing *** architecture can be understood as arising from the superposition of a fully connected entanglement distribution network and port-based virtual local area network,which group multiusers by access *** terms of hardware,we leverage a semiconductor chip with a high figure-of-merit modal overlap to directly generate high-quality polarization entanglement,and a streamlined polarization analysis module,which requires only one single-photon detector for each end *** experimentally perform the BBM92 QKD protocol on the five-user quantum virtual network and demonstrate voice and image encryption on a campus area *** results may provide insights into the realization of large-scale quantum networks with integrated and cost-efficient photonic architecture.

关键词： quantum network quantum entanglement distribution integrated photonics image and voice encryption

All-optical neuromorphic devices: materials, working mechanism,and applications

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Science China Chemistry 2025年

作者： Song Wang Hao Chen Hui Huang college of materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Topological Quantum Computation CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences college of Chemistry and Molecular Engineering Peking University

Traditional von Neumann computing, with physical separation of memory and processing units, cannot satisfy the development of artificial intelligence and cloud computing. Neuromorphic computing, inspired by the human brain, has drawn much ***-optical neuromorphic (AON) devices employ optical signals as information carriers and leverage the neuromorphic functions to implement fast operation speed, low energy consumption, and high bandwidth of neuromorphic computing. Here, we discuss the recent progress in AON devices, including materials, device performance, working mechanisms, and applications. Moreover,the advantages and limitations of AON are presented and discussed. Finally, the perspective of AON devices points out the future research direction of neuromorphic computing.

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Einstein-de Haas effect:a bridge linking mechanics,magnetism,and topology

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Science Bulletin 2025年第3期70卷 301-304页

作者： Xin Nie Dao-Xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric physics and devices State Key Laboratory of Optoelectronic Materials and TechnologiesCenter for Neutron Science and TechnologySchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

The Einstein-de Haas(EdH)effect,which establishes that changes in magnetization induce mechanical rotation,was experimentally demonstrated in 1915[1],independently of Richardson’s[2]earlier conceptual prediction rela... 详细信息

关键词： effect linking topology

Modulation of the octahedral structure and potential superconductivity of La_(3)Ni_(2)O_(7)through strain engineering

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 145-152页

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui Key Laboratory of Material Simulation Methods&Software of Ministry of Education State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun130012China center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of PhysicsSun Yat-sen UniversityGuangzhou510275China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an710049China Institute of High Pressure physics School of Physical Science and TechnologyNingbo UniversityNingbo315211China

The recent transport measurements of La_(3)Ni_(2)O_(7)uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature(P-T)phase *** by this,we perform theoretical first-principles studies of La_(3)Ni_(2)O_(7)with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d_(z^(2))electron density at the Fermi energy(n_(z)^(E_(F)))that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of n_(z)^(E_(F)),we propose that superconductivity can be achieved by applying only ~2GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nz E Fand the superconducting T_(c)in La_(3)Ni_(2)O_(7)*** study provides new routes to the search of high-T_(c)superconductors in future experiments.

关键词： nickelate superconductors density functional theory strong correlated systems strain engineering

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Observation of Superconducting Pair Density Modulation within Lattice Unit Cell

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Chinese physics Letters 2025年第2期42卷 175-205页

作者： Tianheng Wei Yanzhao Liu Wei Ren Zhen Liang Ziqiang Wang Jian Wang International center for quantum materials School of PhysicsPeking UniversityBeijing 100871China quantum Science center of Guangdong–Hong Kong–Macao Greater Bay Area(Guangdong) Shenzhen 518045China Department of physics Boston CollegeChestnut HillMA 02467USA Collaborative Innovation center of quantum Matter Beijing 100871China Hefei National Laboratory Hefei 230088China

In unconventional high-temperature(high-T_(c))superconductors,the pair density wave state,an exotic superconducting order showing spatially periodic order parameter modulations with the period of several unit cells and translational symmetry breaking,has attracted broad ***,the superconducting pair density modulation(PDM)within a single unit cell has never been carefully investigated ***,using scanning tunneling microscopy/spectroscopy,we report the observation of PDM in monolayer high-T_(c) iron chalcogenide films epitaxially grown on SrTiO_(3)(001).The superconductivity modulations are characterized by the superconducting gap size and the coherence peak *** analysis shows that the local maxima and minima in the superconducting gap modulation are centered at the crystallographic locations of the chalcogen atoms,revealing the breaking of the glide-mirror symmetry of the chalcogen atoms in monolayer high-T_(c) iron chalcogenide films grown on SrTiO_(3)(001).Our findings provide precise microscopic information on superconductivity within the lattice unit cell and may promote the understanding of unconventional high-T_(c) superconductivity.

关键词： breaking mirror precise

Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying Cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei Cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage materials College of ChemistryBeijing Normal UniversityBeijing 100875China college of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Key State Laboratory of Advanced Technology for materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Department of physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China State Key Laboratory of Polymer materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065China

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs).However,the diverse structure of donors and acceptors makes the research *** with customizable structures and properties could simplify this ***,we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT)and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT),possessing distinct intermolecular interaction features to elaborate the inherent *** is found that varied interaction strengths can alter film formation *** enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F,facilitating the formation of films with compact molecular packing and decent phase ***,exciton dissociation and charge transport become more ***,devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35%in small-area OSCs and 14.11%in bladecoated 5 cm×5 cm organic solar ***,OSCs can maintain 80%of their initial efficiency after continuous annealing at 85℃for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction