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Energy storage performance and phase transition under high electric field in Na/Ta co-doped AgNbO_(3)ceramics

Journal of Materiomics 2023年第1期9卷 19-26页

作者： Mingyuan Zhao Jing Wang Hao Yuan Zehan Zheng Lei Zhao Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College Physics Science and TechnologyHebei UniversityBaoding071002China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China

Lead-free antiferroelectric ceramics with high energy storage performance show great potential in pulsed power ***,poor breakdown strength and antiferroelectric stability are the two main drawbacks that limit the energy storage performance of antiferroelectric ***,highquality(Ag_(1-x)Na_(x))(Nb_(1-x)Ta_(x))O_(3)ceramics were prepared by the tape casting *** breakdown strength was greatly improved as a result of the high density and fine grains,while the antiferroelectric stability was enhanced owning to the M2 *** from the synergistic improvement in breakdown strength and antiferroelectric stability,(Ag_(0.80)Na_(0.20))(Nb_(0.80)Ta_(0.20))O_(3)ceramic reveals a benign energy storage performance of W_(rec)=5.8 J/cm^(3)and h=61.7%with good temperature stability,frequency stability and cycling *** is also found that the high applied electric field can promote the M2-M3 phase transition,which may provide ideas to improve the thermal stability of the energy storage performance in AgNbO_(3)-based ceramics.

关键词： Antiferroelectric ceramics AgNbO_(3)-based ceramics Phase transition Tape casting process

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The Level-split of the Two-level Entangled Atom in an Optical Field

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Chinese Journal of Lasers 2002年第1期11卷 20-23页

作者： CAO Zhuoliang 1,2 HUANG Ting 2 GUO Guangcan 1 YI Youming 2 ( 1laboratory of Quantum Communication and Quantum computation, University of science and technology of China, Hefei 230026, China 2Department of physics, Anhui University Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of China Hefei 230026 Department of Physics Anhui University Hefei 230039

The behavior of a two-level entangled atom in an optical field with circular polarization is studied in this paper. The interaction of an optical field and one of the entangled atoms is analyzed in detail. A general solution of the SchrAo¨Gdinger equation about the motion of the entangled atom is obtained. The properties of the action are dependent on the initial state of the atom. By detecting the entangled atom out of the field, we can obtain the state of the other atom moving in the field. It is shown that the state of the atom out of the field will influence the energies of the split-levels of the atom in the field.

关键词： entangled atom level-split momentum transfer moving in the field

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Combination of S…N and S…Cl Noncovalently Conformational Locks for Constructing High-Planarity and Low-Cost Nonfused-Ring Electron Acceptors

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Chinese Journal of Chemistry 2023年第15期41卷 1797-1802页

作者： Ziyang Han Congqi Li Xiaobin Gu Xiao Han Sixuan Wang Yanan Wei Jinhua Gao Zhixiang Wei Yunhao Cai Xin Zhang 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 SciencesBeijing 100049China Center for Excellence in Nanoscience(CAS)&Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS) National Center for Nanoscience and TechnologyBeijing 100190China

Comprehensive Summary By employing thiazole and 4-chlorothiazole as the A′units,two A-D-A′-D-A type nonfused-ring electron acceptors(NFREAs)Tz-H and Tz-Cl were designed and *** thiazole in Tz-H with 4-chlorothiazole can not only remarkably shorten the synthetic route through C—H direct arylation but also enhance molecular planarity with the simultaneous incorporation of S…N and S…Cl noncovalently conformational locks(NoCLs).The photovoltaic devices based on PM6:Tz-Cl exhibited a power conversion efficiency as high as 11.10%,much higher than that of PM6:Tz-H(6.41%),mainly due to more efficient exciton dissociation,better and more balanced carrier mobility,less charge recombination,and more favorable *** findings demonstrate the great potential of NoCLs in achieving low-cost and high-performance NFREAs.

关键词： Organic solar cells Nonfused-ring electron acceptors Noncovalently conformational locks High-planarity and low-cost acceptors 4-Chlorothiazole

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Line positions,intensities,and Einstein A coefficients for 3-0 band of^(12)C^(16)O:A spectroscopy learning method

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Chinese physics B 2021年第12期30卷 370-377页

作者： Zhi-Xiang Fan Zhi-Zhang Ni Jie-Jie He Yi-Fan Wang Qun-Chao Fan Jia Fu Yong-Gen Xu Hui-Dong Li Jie Ma Feng Xie School of Science Key Laboratory of High Performance Scientific ComputationXihua UniversityChengdu 610039China State Key Laboratory of Quantum Optics and Quantum Optics Devices Laser Spectroscopy LaboratoryCollege of Physics and Electronics EngineeringShanxi UniversityTaiyuan 030006China Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

Based on the model-and data-driven strategy,a spectroscopy learning method that can extract the novel and hidden information from the line list databases has been applied to the R branch emission spectra of 3-0 band of the ground electronic state of^(12)C^(16)*** labeled line lists such as line intensities and Einstein A coefficients quoted in HITRAN2020 are collected to enhance the *** quantified spectroscopy-learned spectroscopic constants is beneficial for improving the extrapolative accuracy beyond the *** comparisons are made for line positions,line intensities,Einstein A coefficients,which demonstrate that the model-and data-driven spectroscopy learning approach is a promising and an easy-to-implement strategy.

关键词： carbon monoxide line lists a model-and data-driven strategy spectroscopy learning

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Basis light-front quantization for the Λb and Σb baryons

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Physical Review D 2025年第9期111卷 094012-094012页

作者： Lingdi Meng Tian-Cai Peng Zhi Hu Siqi Xu Jiangshan Lan Chandan Mondal Guo-Li Wang Xingbo Zhao James P. Vary Department of Physics Hebei University Baoding 071002 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou Gansu 730000 China School of Physical Science and Technology Lanzhou University Lanzhou 730000 China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Lanzhou University Lanzhou 730000 China Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Lanzhou 730000 China Research Center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CAS Lanzhou 730000 China High Energy Accelerator Research Organization (KEK) Ibaraki 305-0801 Japan School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Advanced Energy Science and Technology Guangdong Laboratory Huizhou Guangdong 516000 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding China

Within the basis light-front quantization framework, we compute the masses and light-front wave functions of the Λb baryon and its isospin triplet counterparts Σb+, Σb0, and Σb− using a light-front effective Hamiltonian in the leading Fock sector. These wave functions are obtained as eigenstates of the effective Hamiltonian, which incorporates the one-gluon exchange interaction with fixed coupling and a three-dimensional confinement potential. With the quark masses and the couplings as adjustable parameters, the computed masses are set within the experimental range. The resulting predictions for their electromagnetic properties align well with other theoretical calculations. Additionally, the parton distribution functions (PDFs) of these baryons are obtained for the first time, with gluon and sea quark distributions dynamically generated through QCD evolution of the valence quark PDFs.

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Beating standard quantum limit via two-axis magnetic susceptibility measurement

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Chinese physics B 2022年第4期31卷 170-174页

作者： Zheng-An Wang Yi Peng Dapeng Yu Heng Fan Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Shenzhen Insititute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

We report a metrology scheme which measures the magnetic susceptibility of an atomic spin ensemble along the x and z directions and produces parameter estimation with precision beating the standard quantum *** atomic ensemble is initialized via one-axis spin squeezing with optimized squeezing time and parameterΦ(to be estimated)assumed as uniformly distributed between 0 and 2πwhile fixed in each *** estimation ofΦcan be produced with every two magnetic susceptibility data measured along the two axes respectively,which has an imprecision scaling(1.43±0.02)/N^(0.687±0.003)with respect to the number N of the atomic *** measurement scheme is easy to implement and is robust against the measurement fluctuation caused by environment noise and measurement defects.

关键词： quantum metrology spin-squeezing standard quantum limit fluctuation

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No-go theorem for one-way quantum computing on naturally occurring two-level systems

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Physical Review A 2011年第5期83卷 050301(R)-050301(R)页

作者： Jianxin Chen Xie Chen Runyao Duan Zhengfeng Ji Bei Zeng Department of Computer Science and Technology Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts USA Centre for Quantum Computation and Intelligent Systems (QCIS) Faculty of Engineering and Information Technology University of Technology Sydney New South Wales Australia Perimeter Institute for Theoretical Physics Waterloo Ontario Canada State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing China Institute for Quantum Computing and Department of Combinatorics and Optimization University of Waterloo Waterloo Ontario Canada

The ground states of some many-body quantum systems can serve as resource states for the one-way quantum computing model, achieving the full power of quantum computation. Such resource states are found, for example, in spin-52 and spin-32 systems. It is, of course, desirable to have a natural resource state in a spin-12, that is, qubit system. Here, we give a negative answer to this question for frustration-free systems with two-body interactions. In fact, it is shown to be impossible for any genuinely entangled qubit state to be a nondegenerate ground state of any two-body frustration-free Hamiltonian. What is more, we also prove that every spin-12 frustration-free Hamiltonian with two-body interaction always has a ground state that is a product of single- or two-qubit states. In other words, there cannot be any interesting entanglement features in the ground state of such a qubit Hamiltonian.

关键词： QUANTUM computers QUANTUM theory HAMILTONIAN operator HAMILTONIAN systems physics

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All-electrical switching of a topological non-collinear antiferromagnet at room temperature

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National science Review 2023年第2期10卷 123-130页

作者： Yongcheng Deng Xionghua Liu Yiyuan Chen Zongzheng Du Nai Jiang Chao Shen Enze Zhang Houzhi Zheng Hai-Zhou Lu Kaiyou Wang State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology (SUSTech) International Quantum Academy Beijing Academy of Quantum Information Sciences Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

Non-collinear antiferromagnetic Weyl semimetals,combining the advantages of a zero stray field and ultrafast spin dynamics,as well as a large anomalous Hall effect and the chiral anomaly of Weyl fermions,have attracted extensive ***,the all-electrical control of such systems at room temperature,a crucial step toward practical application,has not been ***,using a small writing current density of around 5 × 10～6 A·cm-2,we realize the all-electrical current-induced deterministic switching of the non-collinear antiferromagnet Mn3Sn,with a strong readout signal at room temperature in the Si/SiO2/Mn3Sn/AlOxstructure,and without external magnetic field or injected spin *** simulations reveal that the switching originates from the current-induced intrinsic non-collinear spin-orbit torques in Mn3Sn *** findings pave the way for the development of topological antiferromagnetic spintronics.

关键词： spintronics non-collinear antiferromagnetic Weyl semimetals all-electrical switching spin-orbit torques

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Enhanced thermoelectric properties of Cu_(3)SbSe_(4)-based materials by synergistic modulation of carrier concentration and phonon scattering

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Journal of Materiomics 2024年第2期10卷 339-347页

作者： Sitong Wei Zhen Ji Wenhao Li Shuqi Zheng Qing Wang Zhiliang Li Lu Yu Sitong Luo Weiyu Song College of New Energy and Materials China University of PetroleumBeijing102249China College of Science China University of PetroleumBeijing102249China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China

Cu_(3)SbSe_(4),a copper-based sulfide free of rare earth elements,has received extensive attention in ther-moelectric ***,its low carrier concentration restricts its widespread *** this study,a microwave-assisted solution synthesis method was used to produce samples of Cu_(3)SbSe_(4),which enabled the formation of CuSe in situ and increased the *** the use of first-principles cal-culations,structural analysis,and performance evaluation,it was found that CuSe can enhance the carrier concentration and that induced nano-defects have a positive effect on reducing the lattice thermal ***,doping with Sn decreases the band gap of the system and moves the Fermi level into the valence band,increasing the carrier concentration to 1.15×10^(-20)cm^(-3).Finally,the zT value of the Cu_(3)Sb_(0.98)Sn_(0.02)Se_(4)sample was achieved at 1.05 at 623 K when the theoretical yield of a single synthesis was 10 mmol.

关键词： Cu_(3)SbSe_(4) Carrier concentration Phonon scattering Synergistic modulation

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Electronic structure of correlated topological insulator candidate YbB6 studied by photoemission and quantum oscillation

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Chinese physics B 2020年第1期29卷 70-75页

作者： T Zhang G Li S C Sun N Qin L Kang S H Yao H M Weng S K Mo L Li Z K Liu L X Yang Y L Chen State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physics University of MichiganAnn ArborMI 48109USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China National Laboratory of Solid State Microstructures&Department of Materials Science and Engineering Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Quantum Matter BeijingChina Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation Beijing 100190China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA School of Physical Science and Technology ShanghaiTech University and CAS-Shanghai Science Research CenterShanghai 201210China ShanghaiTech Laboratory for Topological Physics Shanghai 200031China Frontier Science Center for Quantum Information Beijing 100084China Department of Physics Clarendon LaboratoryUniversity of Oxford Parks RoadOxford OX13PUUK

Angle-resolved photoemission spectroscopy(ARPES)and torque magnetometry(TM)measurements have been carried out to study the electronic structures of a correlated topological insulator(TI)candidate Yb *** observed clear surface states on the[001]surface centered at theГ^- and М^- points of the surface Brillouin ***,the fermiology revealed by the quantum oscillation of TM measurements agrees excellently with ARPES ***,the band structures we observed suggest that the band inversion in Yb B6 happens between the Yb5 dand B2bands,instead of the Yb5dand Yb4fbands as suggested by previous theoretical investigation,which will help settle the heavy debate regarding the topological nature of samarium/ytterbium hexaborides.

关键词： topological insulator electronic structure surface states

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