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arXiv 2024年

作者： Zhang, Fang Feng, Tao Ruan, Yurong Ye, Xiaoyuan Wen, Bing Zhou, Liang He, Minglin Zhuang, Zhaotong Wu, Liusuo He, Hongtao Sun, Peijie Yu, Zhiyang Liu, Weishu Zhang, Wenqing Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China Department of Physics Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou350108 China Department of Physics Hongkong University 999077 Hong Kong Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Municipal Key-Lab for Advanced Quantum Materials and Devices Guangdong Provincial Key Lab for Computational Science and Materials Design Southern University of Science and Technology Shenzhen518055 China

Magnetic frustration has been recognized as pivotal to investigating new phases of matter in correlation-driven Kondo breakdown quantum phase transitions that are not clearly associated with broken symmetry. The nature of these new phases, however, remains underexplored. Here, we report quantum criticalities emerging from a cluster spin-glass in the heavy-fermion metal TiFexCu2x-1Sb, where frustration originates from intrinsic disorder. Specific heat and magnetic Grüneisen parameter measurements under varying magnetic fields exhibit quantum critical scaling, indicating a quantum critical point near 0.13 Tesla. As the magnetic field increases, the cluster spin-glass phase is progressively suppressed. Upon crossing the quantum critical point, resistivity and Hall effect measurements reveal enhanced screening of local moments and an expanding Fermi surface, consistent with the Kondo breakdown scenario. © 2024, CC BY-NC-SA.

关键词： Spin glass

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Structural and Electronic Properties of Ta2O5 with One Formula Unit

arXiv

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arXiv 2025年

作者： Tong, Yangwu Tang, Huimin Yang, Yong Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei230026 China College of Physics and Technology Guangxi Normal University Guilin541004 China

Based on particle swarm optimization (PSO) algorithm and density functional theory (DFT) calculations, we identify a stable triclinic crystal structure of Ta2O5 (named as γ1-Ta2O5) at atmospheric pressure whose unit cell contains one formula unit (Z=1). Comparison with the Z=1 Ta2O5 structures from the Materials Project [APL Mater. 1, 011002 (2013)] reveals that γ1-Ta2O5 is energetically the most stable among the Z=1 Ta2O5 phases, and is the second most stable among all the Ta2O5 phases. Characterization of γ1-Ta2O5 is carried out by analyzing the X-ray powder diffraction patterns, the elastic, vibrational, thermal and electronic properties. The electronic structures of γ1-Ta2O5 are calculated using standard DFT as well as many-body perturbation theory within the GW approximation. The results indicate that γ1-Ta2O5 is a wide band gap semiconductor with an indirect gap of ~ 3.361 eV. © 2025, CC BY.

关键词： X ray powder diffraction

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Edge reconstructions of black phosphorene: A global search

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Nanoscale 2021年第7期13卷 4085-4091页

作者： Liu, Yue Li, Da Cui, Tian State Key Lab of Superhard Materials College of Physics Jilin University Changchun130012 China School of Physical Science and Technology Ningbo University Ningbo315211 China

Despite reports of possible edge reconstructions of black phosphorene, the underlying mechanisms that determine the atomic configurations and appearance of black phosphorene edges have not been elucidated to date. In this study, the particle swarm optimization (PSO) algorithm is used to perform a global search of black phosphorene edge structures. In addition to the most stable edges, three databases of the typical black phosphorene zigzag edge, armchair edge, and skewed diagonal edge are constructed for the first time. The local phosphorus concentration plays an important role in determining the edge atomic configurations and the appearance of an edge. Variations in the local phosphorus concentration result in the rearrangement of sp3-hybrid bonds or the formation of double bonds that balance the dangling bonds at the edges and stabilize the black phosphorene edges. The black phosphorene edge databases provide a useful reference for edge studies of other 2D materials with puckered honeycomb structures. This journal is. © The Royal Society of Chemistry.

关键词： Honeycomb structures

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Recent progress in perovskite solar cells:from device to commercialization

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science China Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao Yang Zhao Xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng Xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen Xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong Yang Yongguang Tu Xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han Xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental Center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

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Phase-junction Ag/TiO_(2)nanocomposite as photocathode for H_(2)generation

引用

Journal of Materials science & technology 2021年第24期83卷 179-187页

作者： Hemdan S.H.Mohamed Mohamed Rabia Xian-Gang Zhou Xu-Sen Qin Gomaa Khabiri Mohamed Shaban Hussein A.Younus S.Taha Zhi-Yi Hu Jing Liu Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Physics Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanophotonics and Applications Lab Physics DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef62514Egypt Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000NamurBelgium

Developing anatase/rutile phase-junction in Ti O_(2)to construct Z-scheme system is quite effective to improve its photoelectrochemical *** this work,the anatase/rutile phase-junction Ag/Ti O_(2)nanocomposites are developed as photocathodes for hydrogen *** optimized Ag/Ti O_(2)nanocomposite achieves a high current density of 1.28 m A cm-2,an incident photon-to-current conversion efficiency(IPCE)of 10.8%,an applied bias photon-to-current efficiency(ABPE)of 0.32 at 390 nm and a charge carriers’lifetime up to 2000 *** enhancement on photoelectrochemical activity can be attributed to:(ⅰ)the generated Z-scheme system in the anatase/rutile phase-junction Ag/Ti O_(2)photocathode enhances the separation,diffusion and transformation of electron/hole pairs inside the structure,(ⅱ)Ag nanodots modification in the anatase/rutile phases leading to the tuned band gap with enhanced light absorption and(ⅲ)the formed Schottky barrier after Ag nanodots surface modification provides enough electron traps to avoid the recombination of photogenerated electrons and *** results here suggest that developing phase-junction nanocomposite as photocathode will provide a new vision for their enhanced photoelectrochemical generation of hydrogen.

关键词： Ag/TiO_(2)nanocomposites Anatase/rutile phase-junction Z-scheme Photocathode H2 generation

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OWI Controller with FIFO Buffer Function Based on AHB-Lite Bus

OWI Controller with FIFO Buffer Function Based on AHB-Lite B...

引用

IEEE International Workshop on Anti-counterfeiting, Security, Identification, ASID

作者： Zehao Li Guozheng Wang Zhijie Chen Peiyuan Wan Xu Liu School of Physics Changchun University of Science and Technology Changchun 130022 China Beijing Embedded System Key Lab College of Microelectronics Faculty of Information Technology Beijing University of Technology Beijing China

This paper proposes a One-Wire (OWI) digital communication interface with asynchronous First in First out (FIFO) buffering function based on Advanced High-performance Bus (AHB-Lite), which adopts half-duplex mode to realize networking communication between host and multiple slaves. Based on this design, the interface can be specifically configured by the AHB-Lite bus for data, with reading interface status information, and supports parity and glitch filtering filter functions. In order to realize the stability of single-wire communication with external OWI devices in the data transceiver module, the asynchronous FIFO buffer function is added. During the data transmission process, FIFO can buffer single-threaded data. The finite state machine method is used to control the transmission timing of the OWI interface, and Register Transfer Level (RTL) simulation is carried out, which shows that the design can reduce the use of hardware resources and has good practicability.

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Tuning the Quasi-bound States of Double-barrier Structures: Insights from Resonant Tunneling Spectra

arXiv

引用

arXiv 2024年

作者： Li, Wei Yang, Yong Center for Fundamental Physics School of Mechanics and opticelectrical Physics Anhui University of Science and Technology Anhui Huainan232001 China Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei230026 China

In this work, we study the resonant tunneling (RT) of electrons and H atoms in double-barrier (DB) systems. Our numerical calculations directly verify the correspondence between the resonant tunneling energies and the energy levels of quasi-bound states (QBS) within the double barriers. Based on this, in-depth analyses are carried out on the modulation of QBS energy levels and numbers which show step variation with the inter-barrier spacing. The mathematical criterion for the existence of QBS is derived, and the impacts of the barrier width and barrier height on QBS levels are investigated. Taking the rectangular double-barrier as an example, we have studied the manipulation of electronic structures and optical properties of the inter-barrier region (quasi-potential well) by tuning the inter-barrier spacing (width of quasi-potential well). Atom-like optical absorption features are found in the range of infrared to visible spectrum, which can be continuously tuned by the variation of quasi-potential well width. The potential application of double-barrier nanostructures in ultrahigh-precision detection of electromagnetic radiations is demonstrated. © 2024, CC BY.

关键词： Resonant tunneling

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Sol-gel synthesized (1-x)Bi0.5Na0.5TiO3-xAlMnO3 perovskites with enhanced ferromagnetic property

引用

Ceramics International 2025年

作者： Lam, Nguyen Huu Dung, Dang Duc Multifunctional Ferroics Materials Lab. Faculty of Engineering Physics Hanoi University of Science and Technology 1 Dai Co Viet Road Ha Noi Viet Nam Department of Physics University of Ulsan Ulsan44610 Korea Republic of

In this work, (1-x)Bi0.5Na0.5TiO3-xAlMnO3 (x = 0, 0.5, 1, 3, 5, 7, and 9 mol.%) materials were synthesized using a sol-gel method. X-ray diffraction and Raman scattering analyses confirmed the successful incorporation of AlMnO3 into the Bi0.5Na0.5TiO3 lattice. The results demonstrated a random substitution of Al and Mn cations, leading to lattice distortions and modifications in vibrational properties. Optical studies revealed a reduction in the band gap with increasing AlMnO3 content, decreasing from 3.07 eV for pure Bi0.5Na0.5TiO3 to 1.85 eV at 3 mol.% AlMnO3. Additionally, magnetic measurements at room temperature uncovered complex magnetic behavior in AlMnO3-modified Bi0.5Na0.5TiO3. While pure Bi0.5Na0.5TiO3 exhibited weak ferromagnetism with dominant diamagnetic effects, the addition of AlMnO3 enhanced ferromagnetic ordering. This enhancement is attributed to oxygen vacancy-mediated Mn magnetic coupling, as well as the emergence of Na vacancies and Ti3+/Ti2+ states. At higher AlMnO3 concentrations, a combination of ferromagnetic, paramagnetic, and antiferromagnetic-like behaviors was observed. These findings provide valuable insights into enhancing ferromagnetic properties of lead-free ferroelectric materials, paving the way for their use in advanced smart electronic devices. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sol-gel process

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Lithium Ion Batteries Operated at-100℃

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Chinese physics Letters 2023年第8期40卷 32-35页

作者：盖建丽杨纪荣杨伟李泉吴晓东李泓 Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd.Liyang 213300China Institute of Physics Chinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China

Enabling lithium-ion batteries(LIBs)to operate in a wider temperature range,e.g.,as low or high as possible or capable of both,is an urgent need and shared *** we report,for the first time,a low-temperature electrolyte consisting of traditional ethylene carbonate,methyl acetate,butyronitrile solvents,and 1 M LiPF_(6) salt,attributed to its very low freezing point(T_(f)=-126.3℃)and high ion conductivity at extremely low temperatures(0.21 m S/cm at-100℃),successfully extends the service temperature of a practical 9.6 Ah LIB down to-100℃(49.6%capacity retention compared to that at room temperature),which is the lowest temperature reported for practical cells so far as we know,and is lower than the lowest natural temperature(-89.2℃)recorded on ***,the high-temperature performance of lithium-ion batteries is not *** capacity retention is 88.2%and 83.4%after 800 cycles at 25℃and 45℃,*** progress also makes LIB a proper power supplier for space vehicles in astronautic explorations.

关键词： lithium retention freezing

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Quadrupolar topological behavior of elastic waves in nonsymmorphic two-dimensional square lattices

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Physical Review Applied 2025年第3期23卷 034034-034034页

作者： Yijie Liu Yuyang Chen Zhaoyang Guo Zhi-Kang Lin Di Zhou Feng Li Ying Wu School of Civil and Transportation Engineering Guangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China

We investigate a higher-order topological behavior in elastic lattices characterized by nonsymmorphic symmetries. In the theoretical spring-mass lattice, altering the vertex mass allows for fine tuning of the topological features within the band gap. We analyze the quadrupole topological behavior in square lattices with nonsymmorphic symmetries using nested Wannier bands. Beyond second-order topological metamaterials, a single-phase topological configuration promotes energy localization at the corners due to a nonzero relative quadrupole moment. Our findings are validated through experimental observations of higher-order topological corner states, which show excellent agreement with simulated results and theoretical predictions. Additionally, the elastic lattices in the self-similar system exhibit fractal higher-order topological behaviors, revealing numerous topological edge and corner states. The self-similar lattice also demonstrates enhanced energy localization, with the number of topological states showing a linear correlation to the corner dimension. This study provides insights into elastic higher-order topological insulators and inspires innovative strategies for simulating topological elastic materials.

关键词： Topology

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