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National Science Review 2024年第4期11卷 195-205页

作者： Yanhua Wan Changyao Wang Xingmiao Zhang Yang Yin Mengmeng Liu Bing Ma Linlin Duan Yuzhu Ma Wei Zhang Changlin Zheng Dongliang Chao Fei Wang Yongyao Xia Wei Li department of Chemistry Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers College of Chemistry and Materials ScienceFudan University State key laboratory of Surface physics and department of physics Fudan University

Due to their uncontrollable assembly and crystallization process,the synthesis of mesoporous metal oxide single crystals remains a formidable ***,we report the synthesis of single-crystal-like mesoporous Li2TiSiO5by using soft micelles as *** key lies in the atomic-scale self-assembly and step-crystallization processes,which ensure the formation of single-crystal-like mesoporous Li2TiSiO5microparticles via an oriented attachment growth mechanism under the confinement of an in-situ formed carbon *** mesoporous Li2TiSiO5anode achieves a superior rate capability(148 mAh g-1at5.0 A g-1) and outstanding long-term cycling stability(138 mAh g-1after 3000 cycles at 2.0 A g-1) for lithium storage as a result of the ultrafast Li+diffusion caused by penetrating mesochannels and nanosized crystal frameworks（5-10 nm）.In comparison,bulk Li2TiSiO5exhibits poor rate capability and cycle performance due to micron-scale diffusion *** method is very simple and reproducible,heralding a new way of designing and synthesizing mesoporous single crystals with controllable frameworks and chemical functionalities.

关键词： mesoporous materials micelles single-crystal-like Li2TiSiO5 lithium-ion batteries

钼活化ZnIn_(2)S(4)光催化剂促进光催化析氢耦合苯甲醇氧化

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Science China Materials 2024年第8期67卷 2645-2652页

作者：俞杨帆尤晓萌张阳彭玉王雪璐刘鹏飞杨化桂 key laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China physics department&shanghai key laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China

光催化水裂解制氢为解决能源危机提供了一条可行的途径.然而,四电子的水氧化反应迟缓严重制约了水的分解效率.本文中,掺杂Mo的ZnIn_(2)S(4);(Mo-ZIS)光催化剂通过与动力学上有利的苯甲醇(BA)的氧化反应协同整合,显著促进了析氢反应,高... 详细信息

光催化水裂解制氢为解决能源危机提供了一条可行的途径.然而,四电子的水氧化反应迟缓严重制约了水的分解效率.本文中,掺杂Mo的ZnIn_(2)S(4);(Mo-ZIS)光催化剂通过与动力学上有利的苯甲醇(BA)的氧化反应协同整合,显著促进了析氢反应,高价和不饱和Mo不仅促进光生载流子的分离,还促进BA的活化,从而加速BA的氧化.此外,Mo掺杂调节了ZIS的能带结构,增强了光催化剂的氧化能力,而不会引起BA的过度氧化.结果表明,Mo-ZIS光催化剂在不需要贵金属助催化剂的情况下,具有较高的析氢速率(16,353μmol g^(-1)h^(-1))和苯甲醛产率(13,942μmol g^(-1)h^(-1)),显著优于ZIS光催化剂.引人注意的是,通过调节BA与溶剂之间的氢键网络强度来调节中间体在Mo-ZIS表面的解吸过程,Mo-ZIS的BAD产率为23,068μmol g^(-1)h^(-1),相比于乙腈溶液中的反应速率提高了65%.本研究提出了一种有价值的将光催化制氢与选择性有机产物转化相结合的策略,为开发新型光催化剂,实现高效太阳能转化提供了新的见解.

关键词：光催化剂氢键网络析氢反应光生载流子过度氧化反应迟缓能源危机解吸过程

Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal

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Frontiers of physics 2024年第2期19卷 157-167页

作者： Wanting Yang Shuang Zhu Xiong Luo Xiaoxuan Ma Chenfei Shi Huan Song Zhiqiang Sun Yefei Guo Yuriy Dedkov Baojuan Kang Jin-Ke Bao Shixun Cao department of physics Shanghai UniversityShanghai 200444China Materials Genome Institute and International Center for Quantum and Molecular Structures Shanghai UniversityShanghai 200444China School of physics Southeast UniversityNanjing 211189China shanghai key laboratory of High Temperature Superconductors Shanghai UniversityShanghai 200444China

Rare-earth orthoferrite REFeO_(3)(where RE is a rare-earth ion)is gaining *** created a high-entropy orthoferrite(Tm_(0.2)Nd_(0.2)Dy_(0.2)Y_(0.2)Yb_(0.2))FeO_(3)(HEOR)by doping five RE ions in equimolar ratios and grew the single crystal by optical floating zone *** strongly tends to form a single-phase structure stabilized by high configurational *** the low-temperature region(11.6‒14.4 K),the spin reorientation transition(SRT)ofΓ_(2)(F_(x),C_(y),G_(z))‒Γ_(24)‒Γ_(4)(G_(x),A_(y),F_(z))*** weak ferromagnetic(FM)moment,which comes from the Fe sublattices distortion,rotates from the a-to *** two-step dynamic processes(Γ_(2)‒Γ_(24)‒Γ_(4))are identified by AC susceptibility *** in HEOR can be tuned in the range of 50‒60000 Oe,which is an order of magnitude larger than that of orthoferrites in the peer system,making it a candidate for high-field spin *** spin-switching(SSW)and continuous spin-switching(CSSW)effects occur under low magnetic fields due to the strong interactions between RE‒Fe *** CSSW effect is tunable between 20‒50 Oe,and hence,HEOR potentially can be applied to spin modulation ***,because of the strong anisotropy of magnetic entropy change()and refrigeration capacity(RC)based on its high configurational entropy,HEOR is expected to provide a novel approach for refrigeration by altering the orientations of the crystallographic axes(anisotropic configurational entropy).

关键词： high-entropy oxide rare-earth orthoferrite spin reorientation transition spin switching magnetocaloric effect

Applying deep learning technique to chiral magnetic wave search

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Chinese physics C 2024年第8期48卷 170-176页

作者： Yuan-Sheng Zhao Xu-Guang Huang physics department and Center for Particle physics and Field Theory Fudan UniversityShanghai 200433China key laboratory of Nuclear physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China shanghai Research Center for Theoretical Nuclear physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

The chiral magnetic wave(CMW)is a collective mode in quark-gluon plasma originated from the chiral magnetic effect(CME)and chiral separation *** detection in heavy-ion collisions is challenging owing to significant background ***[*** et al.,***.C 106,L051901(2022)],we constructed a neural network that accurately identifies the CME-related signal from the final-state pion *** this study,we have generalized this neural network to the case of CMW *** show that,after an updated training,the neural network effectively recognizes the CMW-related ***,we have assessed the performance of the neural network in comparison with other known methods for CMW search.

关键词： deep learning chiral magnetic wave relativistic heavy-ion collisions

Universal Machine Learning Kohn–Sham Hamiltonian for Materials

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Chinese physics Letters 2024年第7期41卷 95-110页

作者：钟阳于宏宇杨吉辉郭星宇向红军龚新高 key laboratory of Computational Physical Sciences(Ministry of Education) Institute of Computational Physical SciencesState Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China shanghai Qi Zhi Institute Shanghai 200030China

While density functional theory(DFT)serves as a prevalent computational approach in electronic structure calculations,its computational demands and scalability limitations ***,leveraging neural networks to parameterize the Kohn-Sham DFT Hamiltonian has emerged as a promising avenue for accelerating electronic structure *** advancements,challenges such as the necessity for computing extensive DFT training data to explore each new system and the complexity of establishing accurate machine learning models for multi-elemental materials still *** these hurdles,this study introduces a universal electronic Hamiltonian model trained on Hamiltonian matrices obtained from first-principles DFT calculations of nearly all crystal structures on the Materials *** demonstrate its generality in predicting electronic structures across the whole periodic table,including complex multi-elemental systems,solid-state electrolytes,Moir´e twisted bilayer heterostructure,and metal-organic ***,we utilize the universal model to conduct high-throughput calculations of electronic structures for crystals in GNoME datasets,identifying 3940 crystals with direct band gaps and 5109 crystals with flat *** offering a reliable efficient framework for computing electronic properties,this universal Hamiltonian model lays the groundwork for advancements in diverse fields,such as easily providing a huge data set of electronic structures and also making the materials design across the whole periodic table possible.

关键词： Hamiltonian utilize twisted

Electronic Correlation and Pseudogap-Like Behavior of High-Temperature Superconductor La_(3)Ni_(2)O_(7)

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Chinese physics Letters 2024年第8期41卷 82-93页

作者： Yidian Li Xian Du Yantao Cao Cuiying Pei Mingxin Zhang Wenxuan Zhao Kaiyi Zhai Runzhe Xu Zhongkai Liu Zhiwei Li Jinkui Zhao Gang Li Yanpeng Qi Hanjie Guo Yulin Chen Lexian Yang State key laboratory of Low Dimensional Quantum physics Department of PhysicsTsinghua UniversityBeijing 100084China key lab for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China Songshan Lake Materials laboratory Dongguan 523808China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China shanghaiTech laboratory for Topological physics Shanghai 200031China shanghai key laboratory of High-Resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China department of physics Clarendon LaboratoryUniversity of OxfordParks RoadOxford OX13PUUK Frontier Science Center for Quantum Information Beijing 100084China

High-temperature superconductivity(HTSC)remains one of the most challenging and fascinating mysteries in condensed matter ***,superconductivity with transition temperature exceeding liquid-nitrogen temperature is discovered in La_(3)Ni_(2)O_(7) at high pressure,which provides a new platform to explore the unconventional *** this work,using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation,we systematically investigate the electronic structures of La_(3)Ni_(2)O_(7) at ambient *** experiments are in nice agreement with ab initio calculations after considering an orbital-dependent band renormalization *** strong electron correlation effect pushes a flat band of d_(z^(2))𝑧2 orbital component below the Fermi level(E_(F)),which is predicted to locate right at E_(F) under high ***,the d_(x^(2)−y^(2)) band shows pseudogap-like behavior with suppressed spectral weight and diminished quasiparticle peak near E_(F).Our findings provide important insights into the electronic structure of La_(3)Ni_(2)O_(7),which will shed light on understanding of the unconventional superconductivity in nickelates.

关键词： effect. superconductivity orbital

Pressure-Tuned Intrinsic Anomalous Hall Conductivity in Kagome Magnets RV_(6)Sn_(6)(R=Gd,Tb)

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Chinese physics Letters 2024年第4期41卷 139-151页

作者：孔祥明陶咨成张蕊夏威陈旭裴翠颖应天平齐彦鹏郭艳峰杨小帆李世燕 State key laboratory of Surface physics Department of PhysicsFudan UniversityShanghai 200438China shanghai Research Center for Quantum Sciences Shanghai 201315China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China shanghaiTech laboratory for Topological physics Shanghai 201210China Northwest Institute for Non-Ferrous Metal Research Xi'an 710016China Beijing National laboratory for Condensed Matter physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China shanghai key laboratory of High-resolution Electron Microscopy Shanghai 201210China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Exploration of exotic phenomena in magnetic topological systems is at the frontier of condensed matter physics,holding a significant promise for applications in topological ***,complex magnetic structures carrying nontrivial topological properties hinder its ***,we investigate the pressure effect on the novel topological kagome magnets GdV_(6)Sn_(6) and TbV_(6)Sn_(6) to dig out the interplay between magnetic Gd/Tb layers and nonmagnetic V-based kagome *** pressure-tuned magnetic transition temperature Tm in both the compounds exhibit a turning point at the critical pressure P_(c),accompanied with a sign reversal in anomalous Hall effect(AHE).The separation of intrinsic and extrinsic contributions using the Tian-Ye-Jin scaling model suggests that the intrinsic mechanism originating from the electronic Berry curvature holds the priority in the competition with extrinsic mechanism in *** above-mentioned findings can be attributed to the combined effect of pressure-tuned band topology and magnetic interaction in segregated *** results provide a practical route to design and manipulate the intrinsic AHE in magnetic topological materials.

关键词： holds frontier hinder

Nearly degenerate ground states of a checkerboard antiferromagnet and their bosonic interpretation

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Science China(physics,Mechanics & Astronomy) 2024年第1期67卷 84-89页

作者： Haiyuan Zou Fan Yang Wei Ku key laboratory of Polar Materials and Devices(MOE) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China department of physics Beijing Institute of TechnologyBeijing 100081China Tsung-Dao Lee Institute Shanghai 200240China key laboratory of Artificial Structures and Quantum Control(Ministry of Education) Shanghai 200240China shanghai Branch Hefei National LaboratoryShanghai 201315China

The spin-1/2 model system with antiferromagnetic(AF) couplings on a J1-J2checkerboard lattice, known as the planar pyrochlore model, is strongly frustrated and associated with a two-to-one dimensional crossover. Using the Projected Entangled Simplex States tensor network ansatz, we identify a large number of nearly degenerate states in the frustrated region(J_(1)physics. Particularly, it predicts weaker VBS states in the easy-plane limit, which we confirm numerically. Our results clarify the most essential ground state properties of this interesting system and demonstrate the usefulness of bosonic picture in dealing with frustrated magnetism.

关键词： tensor networks frustrated magnetism dimensional crossover degenerate states

Observation of accurately designed bound states in the continuum in momentum space

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Photonics Research 2024年第4期12卷 638-647页

作者： JIAJU WU JINGGUANG CHEN XIN QI ZHIWEI GUO JIAJUN WANG FENG WU YONG SUN YUNHUI LI HAITAO JIANG LEI SHI JIAN ZI HONG CHEN MOE key laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China State key laboratory of Surface physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Bound states in the continuum(BICs)in artificial photonic structures have received considerable attention since they offer unique methods for the extreme field localization and enhancement of light-matter ***,the symmetry-protected BICs are located at high symmetric points,while the positions of accidental BICs achieved by tuning the parameters will appear at some points in momentum *** to now,to accurately design the position of the accidental BIC in momentum space is still a ***,we theoretically and experimentally demonstrate an accurately designed accidental BIC in a two-coupled-oscillator system consisting of bilayer gratings,where the optical response of each grating can be described by a single resonator *** changing the interlayer distance between the gratings to tune the propagation phase shift related to wave vectors,the position of the accidental BIC can be arbitrarily controlled in momentum ***,we present a general method and rigorous numerical analyses for extracting the polarization vector fields to observe the topological properties of BICs from the polarization-resolved transmission ***,an application of the highly efficient second harmonic generation assisted by quasi-BIC is *** work provides a straightforward strategy for manipulating BICs and studying their topological properties in momentum space.

关键词： polarization tuning resonator

Multi-carrier Tb/s silicon photonic coherent receiver

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Science China(Information Sciences) 2024年第1期67卷 284-291页

作者： Zhen WANG Xingfeng LI Jingchi LI Jian SHEN Yong ZHANG Yikai SU State key lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

We propose a silicon polarization-diversity coherent receiver for wavelength-multiplexing transmission without using the large-footprint arrayed waveguide grating(AWG).We have integrated our proposed coherent receiver on the silicon-on-insulator(SOI) platform for high-capacity *** the proposed coherent receiver,high-frequency photocurrent signals from other wavelengths are suppressed by electrical low-pass ***,the signal-signal beat interference(SSBI) generated from each wavelength is eliminated by the balanced *** two features lend to the proposed coherent receiver being free of the mm-scale *** have demonstrated our proposed coherent receiver to detect a 1.12-Tb/s wavelength-division-multiplexed and polarization-division-multiplexed 16-ary quadrature amplitude modulation(PDM-16-QAM) *** compact footprint of the silicon chip promises small-form-factor receivers for future ultra-high-capacity coherent communication systems that require a high integration level and low fabrication cost.

关键词： silicon photonics optical receivers coherent communication wavelength-division-multiplexing(WDM) polarization-division-multiplexing(PDM)