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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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The effect of room temperature magnetic field on photoluminescence of Mn:CsPbBr_(3) quantum dots prepared by one-pot method in air

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Nano Research 2025年第4期18卷 561-568页

作者： Mengwei Chen Chenguang Shen Wei Huang Yingping Yang Jie Shen Department of Physics School of Physics and MechanicsWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

The generation and manipulation of spin-polarized electrons at room temperature are essential for the development of advanced spin-optoelectronic *** this work,a one-pot method was used to successfully synthesize homogenous Mn:CsPbBr_(3) perovskite quantum dots in air with particle sizes of 7−8 *** effects of Mn doping on the structure,optical and magnetic properties of CsPbBr_(3) quantum dots were *** findings demonstrated proper Mn doping improved the crystallinity and photoluminescence(PL)of quantum *** prepared quantum dots have a narrow full width at half maximum emission(FWHM)of about 17−20 *** magnetic properties of the doped samples and the effect of the magnetic field on the PL spectra properties were *** results show that trace Mn doping can improve the room-temperature ferromagnetism of CsPbBr_(3) quantum *** with magnetic elements makes CsPbBr_(3) quantum dots more responsive to the applied magnetic *** at a lower 50 mT magnetic field,the PL peak of Mn:CsPbBr_(3) still declined 5.91%.Mn:CsPbBr_(3) quantum dots are a new type of multifunctional material that is beneficial to spintronics *** work demonstrates a low-cost synthesis *** should make all-inorganic perovskite quantum dots a promising material for room-temperature spin optoelectronic devices.

关键词： CsPbBr_(3)quantum dots Mn doping one-pot method ferromagnetism magnetic field

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Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at CSNS Back-n

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nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da Tang Yong-Hao Chen Jing-Yu Tang Rui-Rui Fan Qiang Li Gong Li Dong Liu Zheng-Yao Jin Xing-Zhu Cui Tian-Xiang Chen Yi-Wei Yang Rong Liu Han Yi Yang Li Zhen Yang Qi An Hao-Fan Bai Jiang-Bo Bai Jie Bao Ping Cao Qi-Ping Chen Zhen Chen Zeng-Qi Cui An-Chuan Fan Chang-Qing Feng Fan-Zhen Feng Ke-Qing Gao Min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu Han-Xiong Huang Wei-Hua Jia Hao-yu Jiang Wei Jiang Zhi-jie Jiang Ling Kang Bo Li Chao Li Jia-Wen Li Xiao Li Jie Liu Shu-Bin Liu Guang-Yuan Luan Chang-Jun Ning Bin-Bin Qi Jie Ren Zhi-Zhou Ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Xin Tan Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Li-Kun Xie Yong-Ji Yu Guo-Hui Zhang Lin-Hao Zhang Mo-Han Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-Liang Zhang Yue Zhang Zhi-Yong Zhang Mao-Yuan Zhao Lu-Ping Zhou Zhi-Hao Zhou Ke-Jun Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Institute of High-Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron *** resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an *** back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the China Spallation Neutron Source(CSNS)that provides neutrons in the eV to 300 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test *** results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at *** study reveals its potential future applications.

关键词： CSNS White neutron beam NRTA Nuclide identification Nondestructive method

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Application of kernel ridge regression in predicting neutron-capture reaction cross-sections

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Communications in Theoretical physics 2022年第9期74卷 98-104页

作者： T X Huang X H Wu P W Zhao State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

This article provides the first application of the machine-learning approach in the study of the cross-sections for neutron-capture reactions with the kernel ridge regression(KRR)*** is found that the KRR approach can reduce the root-mean-square(rms)deviation of the relative errors between the experimental data of the Maxwellian-averaged(n,γ)cross-sections and the corresponding theoretical predictions from 69.8%to 35.4%.By including the data with different temperatures in the training set,the rms deviation can be further significantly reduced to 2.0%.Moreover,the extrapolation performance of the KRR approach along different temperatures is found to be effective and reliable.

关键词： kernel ridge regression machine learning neutron-capture reaction

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From Topological Nodal-Line Semimetals to Quantum Spin Hall Insulators in Tetragonal SnX Monolayers(X=F,Cl,Br,I)

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Chinese physics Letters 2024年第6期41卷 98-111页

作者：朱晔赵宝薛阳徐玮徐文婷杨中芹 State Key Laboratory of Surface Physics Key Laboratory of Computational Physical Sciences(MOE)and Department of PhysicsFudan UniversityShanghai 200433China Shandong Key Laboratory of Optical Communication Science and Technology School of Physics Science and Information TechnologyLiaocheng UniversityLiaocheng 252059China School of Physics East China University of Science and TechnologyShanghai 200237China Shanghai Qi Zhi Institute Shanghai 200030China

Two-dimensional(2D)topological materials have recently garnered significant interest due to their profound physical properties and promising applications for future quantum *** various topological states within one type of materials is,however,seldom *** on first-principles calculations and tightbinding models,we investigate topological electronic states in a novel family of 2D halogenated tetragonal stanene(T-SnX,X=F,Cl,Br,I).All the four monolayers are found to be unusual topological nodal-line semimetals(NLSs),protected by a glide mirror *** spin-orbit coupling(SOC)is turned on,T-SnF and TSnCl are still ascertained as topological NLSs due to the remaining band inversion,primarily composed of Sn pxy orbitals,while T-Sn Br and T-SnI become quantum spin Hall *** phase transition is ascribed to moving up in energy of Sn s orbitals and increasing of SOC *** topology origin in the materials is uniformly rationalized through elementary band *** robust and diverse topological states found in the 2D T-SnX monolayers position them as an excellent material platform for development of innovative topological electronics.

关键词： topological metals quantum

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Different mechanisms of A-site and B-site high entropy effect on radiation tolerance of pyrochlores

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Journal of Materials Science & technology 2024年第24期191卷 250-258页

作者： Yuxin Li Yiming Lei Hao Xiao Shuang Zhao Yugang Wang Zini Cao Jie Zhang Jingyang Wang Guowei Lu Liuxuan Cao Chenxu Wang State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-Optoelectronics&Collaborative Innovation Center of Quantum MatterSchool of PhysicsPeking UniversityBeijing 100871China College of Energy Xiamen UniversityXiamen 361102China

The properties of high entropy pyrochlore have been studied extensively,but there is no consistent conclusion on its radiation ***,the mechanism of the high entropy effect on the radiation tolerance of pyrochlore is still *** this work,combined with experiments and calculations of pyrochlores with similar cationic radius ratios,the A-site and B-site high entropy effects on structural evolution under irradiation are *** situ irradiation experiments were carried out on A-site high entropy pyrochlores such as(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Er_(0.2))_(2)Zr_(2)O_(7),B-site Gd_(2)(Ti_(1/3)Sn_(1/3)Zr_(1/3))_(2)O_(7),and ternary pyrochlore Sm_(2)Zr_(2)O_(7) and Gd_(2)Sn_(2)O_(7) for *** A-site high entropy pyrochlore can maintain a stable structure under high fluence irradiation like corresponding ternary pyrochlore,demonstrated by high angle annular dark field scanning transmission electron microscopy(HAADF-STEM),energy dispersive spectroscopy(EDS)mapping and Raman *** additional irradiation experiments on A-site high entropy pyrochlores(La_(1/3)Nd_(1/3)Gd_(1/3))_(2)Zr_(2)O_(7) and(Nd_(1/3)Sm_(1/3)Gd_(1/3))_(2)Zr_(2)O_(7) also confirm the similarity under irradiation between A-site high entropy and ternary ***,the B-site high entropy pyrochlore Gd_(2)(Ti_(1/3)Sn_(1/3)Zr_(1/3))_(2)O_(7) becomes amorphous at exceptionally low irradiation fluences,indicating a significantly distinct radiation tolerance compared with the A-site high *** difference between the A-site and B-site high entropy effect is analyzed from cationic lattice distortion,bond strength,and inner electron binding energy by first-principles *** results reveal the role and mechanism of the high entropy effect in pyrochlores and lay a foundation for material design and future applications.

关键词： High entropy pyrochlores In situ irradiation Crystal overlap Hamilton population Electron binding energy

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Jet tagging with more-interaction particle transformer

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Chinese physics C 2025年第1期49卷 164-176页

作者： Yifan Wu Kun Wang Congqiao Li Huilin Qu Jingya Zhu College of Science University of Shanghai for Science and TechnologyShanghai 200093China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China CERN EP DepartmentCH-1211 Geneva 23Switzerland School of Physics and Electronics Henan UniversityKaifeng 475004China

In this paper,we introduce the More-Interaction Particle Transformer(MIParT),a novel deep-learning neural network designed for jet *** framework incorporates our own design,the More-Interaction Attention(MIA)mechanism,which increases the dimensionality of particle interaction *** tested MIParT using the top tagging and quark-gluon *** results show that MIParT not only matches the accuracy and AUC of LorentzNet and a series of Lorentz-equivariant methods,but also significantly outperforms the ParT model in background ***,it improves background rejection by approximately 25% with a signal efficiency of 30% on the top tagging dataset and by 3% on the quark-gluon ***,MIParT requires only 30% of the parameters and 53% of the computational complexity needed by ParT,proving that high performance can be achieved with reduced model *** very large datasets,we double the dimension of particle embeddings,referring to this variant as MIParT-Large(MIParT-L).We found that MIParT-L can further capitalize on the knowledge from large *** a model pre-trained on the 100M JetClass dataset,the background rejection performance of fine-tuned MIParT-L improves by 39% on the top tagging dataset and by 6% on the quark-gluon dataset,surpassing that of fine-tuned ***,the background rejection of fine-tuned MIParT-L improves by an additional 2% compared to that of fine-tuned *** results suggest that MIParT has the potential to increase the efficiency of benchmarks for jet tagging and event identification in particle physics.

关键词： jet tagging collider physics machine learning

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Performance limit prediction of atomically thin In2O3 transistors

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Science China(Information Sciences) 2025年第4期68卷 399-400页

作者： Zongmeng YANG Shibo FANG Linqiang XU Qiuhui LI Jichao DONG Ying LI Baochun WU Mughira GHAFOOR Peiqi YANG Ying GUO Shimin HOU Zhaochu LUO Jing LU State Key Laboratory for Mesoscopic Physics and School of Physics Peking University State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Center for Nanoscale Science and Technology Key Laboratory for the Physics and Chemistry of NanodevicesDepartment of Electronics Peking University School of Materials Science and Engineering Xi'an University of Technology School of Physics and Telecommunication Engineering Shaanxi Key Laboratory of CatalysisShaanxi University of Technology Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MEMD) Peking University Collaborative Innovation Center of Quantum Matter Peking University Yangtze Delta Institute of Optoelectronics Key Laboratory for the Physics and Chemistry of Nanodevices Peking University Beijing Key Laboratory of Quantum Devices Peking University

Moore's law requires the downscaling of metal oxide semiconductor field effect transistors（MOSFETs） for future integrated circuits（ICs） development. The performance of Si-based MOSFETs becomes insufficient to meet the standards outlined in the international technology roadmap for semiconductors（ITRS） due to short-channel effects as the channel length shrinks below 10 nm [1]. Ultrathin thin In2O3films with atomically smooth surfaces have recently been fabricated using atomic layer deposition（ALD） [2].

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Machine learning in nuclear physics at low and intermediate energies

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Science China(physics,Mechanics & Astronomy) 2023年第8期66卷 1-19页

作者： Wanbing He Qingfeng Li Yugang Ma Zhongming Niu Junchen Pei Yingxun Zhang Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China School of Science Huzhou UniversityHuzhou 313000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 73000China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China

Machine learning(ML)is becoming a new paradigm for scientific research in various research fields due to its exciting and powerful capability of modeling tools used for big-data processing *** this review,we first briefly introduce the different methodologies used in ML algorithms and *** a snapshot of many applications by ML,some selected applications are presented,especially for low-and intermediate-energy nuclear physics,which include topics on theoretical applications in nuclear structure,nuclear reactions,properties of nuclear matter,and experimental applications in event identification/reconstruction,complex system control,and firmware ***,we present a summary and outlook on the possible directions of ML use in low-intermediate energy nuclear physics and possible improvements in ML algorithms.

关键词： machine learning nuclear physics low and intermediate energies

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A novel Li-ion based transistor within LiCoO2/Li6.75La3Zr1.5Ta0.5O12/Ag scheme

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Progress in Natural Science:Materials International 2025年第1期35卷 194-200页

作者： Jixiang Yin Houning Song Peirong Li Yuzhi Xing Supeng Chen Qi Liang Yu Feng Dong Yang Wenxiao Zhao Dong Wang Qinghao Li Pengfei Yu Qiang Li Xiaosong Liu Yanxue Chen College of Physics Qingdao University School of Physics State Key Laboratory of Crystal Materials Shandong University Center for Transformative Science ShanghaiTech University National Synchrotron Radiation Laboratory University of Science and Technology of China

Traditional electronic devices are reaching their physical limits as they shrink in size to improve integration. Solid ionic devices have become promising candidate to avoid tunneling effect and address these constraints, but the response time are typically sluggish. In recent years, the rapid development of solid electrolyte and solid-state battery provide superior choices to overcome limitations in ion transport. In this work, we construct an ionic transistor within Ag/LiCoO2/Li6.75La3Zr1.5Ta0.5O12（LLZTO）/Ag structure. LiCoO2serves as the channel layer of the transistor, with LLZTO acting as the electrolyte to isolate electrons and facilitate ion conduction, and Ag as the gate/anode. XRD, Raman spectroscopy, and electrochemical characterization confirm lithiation and *** characterization demonstrates the continuous resistive switching of the LiCoO2channel layer between high and low resistive states under pulsed gate voltage control, exhibiting high reversibility and long cycle stability. By combining X-ray absorption spectroscopy（XAS） and X-ray emission spectroscopy（XES）, the transition between high and low resistive states can be well clarified by a first-order Mott transition scheme. These results provide new perspectives for performance improvement and further development of ionic devices.

关键词： Electrolytes Ionic conductivity Phase transitions Transistors X-ray spectroscopy

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