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Observation of Mott instability at the valence transition of f-electron system

National science Review 2023年第6期10卷 183-190页

作者： Haifeng Yang Jingjing Gao Yingying Cao Yuanji Xu Aiji Liang Xiang Xu Yujie Chen Shuai Liu Kui Huang Lixuan Xu Chengwei Wang Shengtao Cui Meixiao Wang Lexian Yang Xuan Luo Yuping Sun Yi-feng Yang Zhongkai Liu Yulin Chen School of Physical Science and Technology Shanghai Tech University Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Science Island Branch of Graduate School University of Science and Technology of China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Shanghai Tech Laboratory for Topological Physics State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences High Magnetic Field Laboratory Chinese Academy of Sciences Collaborative Innovation Center of Microstructures Nanjing University Songshan Lake Materials Laboratory Department of Physics University of Oxford

Mott physics plays a critical role in materials with strong ele ctronic *** insulator-to-metal transition can be driven by chemical doping,external pressure,temperature and gate voltage,which is often seen in transition metal oxides with 3d electrons near the Fermi energy（*** superconductor）.In4f-electron systems,however,the insulator-to-metal transition is mostly driven by Kondo hybridization and the Mott physics has rarely been explored in ***,by combining the angle-resolved photo emission spectroscopy and strongly correlated band structure calculations,we show that an unusual Mott instability exists in YbInCu4accompanying its mysterious first-order valence *** contrasts with the prevalent Kondo picture and demonstrates that YbInCu4is a unique platform to explore the Mott physics in Kondo lattice *** work provides important insight for the understanding and manipulation of correlated quantum phenomena in the f-electron system.

关键词： valence transition orbital-selectiveMott transition Kondo coupling heavy fermions strong correlations ARPES DMFT

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Wavelength-and ellipticity-dependent photoelectron spectra from multiphoton ionization of atoms

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Chinese physics B 2023年第2期32卷 223-228页

作者：郭珂雨黎敏梁锦台曹传鹏周月明陆培祥 School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China

We theoretically study the photoelectron momentum distributions from multiphoton ionization of a model lithium atom over a range of laser wavelengths from 500 nm to 700 nm by numerically solving the time-dependent Schr ¨odinger equation. The photoelectron momentum distributions display many ring-like patterns for the three-photon ionization, which vary dramatically with the change of the laser wavelength. We show that the wavelength-dependent photoelectron energy spectrum can be used to effectively identify the resonant and nonresonant ionization pathways. We also find an abnormal ellipticity dependence of the electron yield for the(2+1) resonance-enhanced ionization via the 4d intermediate state, which is relevant to the two-photon excitation probability from the ground state to the 4d state.

关键词： multiphoton ionization ultrafast phenomena Freeman resonance

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Design of an Active Reflective Metasurface for Polarization Manipulating 12

Design of an Active Reflective Metasurface for Polarization ...

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12th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2024

作者： Wang, Jianxiao Xi, Qiangli Bai, He Liu, Shuo National Key Laboratory of Science and Technology on Space Microwave Xi'an China

ISBN: (纸本)9798350351019

A muti-functional reconfigurable polarization manipulating metasurface is proposed, which can operate in polarization conversion or reflection mode under different bias voltages(±5v). In polarization conversion mode, it can convert a x-polarized/y-polarized incident EM wave to a LHCP/RHCP reflection EM wave, and the simulated axial ratio of reflection EM wave is below 3.0 dB during its conversion bandwidth 4.46GHz5.54GHz. In reflection mode, it can maintain the polarization of reflected EM wave same with incident EM wave. © 2024 IEEE.

关键词： Electromagnetic wave polarization

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Modification of laser-induced state in atomic attosecond transient absorption by the XUV pulse pair

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Communications in Theoretical physics 2023年第1期75卷 138-146页

作者： Xuhong Li Guanglu Yuan Xiangyu Tang Yong Fu Kan Wang Bincheng Wang Cheng Jin Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Experimental teaching center of physics Nanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing Nanjing University of Science and TechnologyNanjing 210094China

Attosecond transient absorption(ATA)has been developed as an all-optical technique for probing electron dynamics in *** we present a scheme that can modify the laserinduced state and the corresponding ATA spectrum via excitation by a pair of XUV attosecond pulses and by a time-delayed mid-infrared(MIR)laser *** from the scheme of the electronic excitation by a single XUV attosecond pulse,the application of a pair of XUV pulses provides extra degrees of freedom,such as the time delay and the intensity ratio between two XUV pulses,which make it possible to adjust the pump process,resulting in the modification of the ATA *** show that by varying the time delay between the two XUV pulses,the population of the dark state and the ATA spectrum of the laser-induced state have periodic *** also demonstrate that the peak of the ATA spectrum of the laser-induced state appears at a fixed time delay between the XUV pair and the MIR laser when the intensity ratio is large,and it changes with the time delay when the intensity ratio is small,which can be related to either one of two peaks in the population of the dark state.

关键词： attosecond transient absorption laser-induced state XUV pulse pair dark state multilevel model

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Quantum Anomalous Hall Effect with Tunable Chern Numbers in High-Temperature 1T-PrN_(2) Monolayer

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Chinese physics Letters 2024年第5期41卷 77-84页

作者：吴绪才李树宗司君山黄博张卫兵 Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering School of Physics and Electronic SciencesChangsha University of Science and TechnologyChangsha 410114China

Quantum anomalous Hall(QAH) insulators have highly potential applications in spintronic device. However,available candidates with tunable Chern numbers and high working temperature are quite rare. Here, we predict a 1T-PrN_(2) monolayer as a stable QAH insulator with high magnetic transition temperature of above 600 K and tunable high Chern numbers of C = ±3 from first-principles calculations. Without spin-orbit coupling(SOC),the 1T-PrN_(2) monolayer is predicted to be a p-state Dirac half metal with high Fermi velocity. Rich topological phases depending on magnetization directions can be found when the SOC is considered. The QAH effect with periodical changes of Chern number(±1) can be produced when the magnetic moment breaks all twofold rotational symmetries in the xy plane. The critical state can be identified as Weyl half semimetals. When the magnetization direction is parallel to the z-axis, the system exhibits high Chern number QAH effect with C = ±*** work provides a new material for exploring novel QAH effect and developing high-performance topological devices.

关键词： magnetization topological monolayer

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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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Cationic pre-insertion interlayer engineering of manganese dioxide for highly efficient electromagnetic wave absorption

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材料科学技术（英文版） 2025年第3期206卷 297-306页

作者： Yue Zhang Xin Yang Changyi Zheng Jiayue Wen Xingwang Hou Weiping Ye Kunyao Cao Rui Zhao Wenjian Wang Fei Han Weidong Xue School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054PR China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054PR China Tianfu Jiangxi Laboratory Chengdu 610041PR China Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800PR China Institute of Energy Research Jiangxi Academy of SciencesNanchang 330096PR China

Interlayer engineering of two-dimensional structural materials provides unique advantages for tuning the electromagnetic properties of metal oxides,injecting unlimited energy into the design of advanced two-dimensional metal oxide electromagnetic wave *** this study,Manganese dioxide intercalated with alkali metal ions was prepared by a simple molten salt *** pre-intercalation of ions not only enhances the polarization loss at the heterogeneous interface between cations(point sites)and man-ganese dioxide(face sites)but also alters the energy band structure of manganese oxide and enhances its electrical conductivity,which in turn enhances the conductive loss of the manganese *** to the synergistic effect of multiple polarizations and conductive losses,NaMO exhibits superb electromag-netic wave absorption properties and an effective absorption bandwidth of 5.36 GHz at thinner matched *** addition,the RCS simulation result further verifies the excellent electromagnetic wave ab-sorption capability of *** the positive incidence of electromagnetic waves,the electromagnetic wave reflection intensity of the metal plate coated with NaMO is effectively ***,this work establishes a new way to modulate the electromagnetic properties.

关键词： Manganese dioxide Ion intercalation Molten salt method Electromagnetic wave absorption

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Magnetic domain structures in ultrathin Bi_(2)Te_(3)/CrTe_(2) heterostructures

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Chinese physics B 2024年第8期33卷 511-517页

作者：夏体瑞杨笑天张逸凡刘馨琪蔡新雨刘畅姚岐寇煦丰王文波 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Department of Materials Science Fudan UniversityShanghai 200438China

Chromium tellurium compounds are important two-dimensional van der Waals ferromagnetic materials with high Curie temperature and chemical stability in air,which is promising for applications in spintronic ***,highquality spin-orbital-torque(SOT)device,Bi_(2)Te_(3)/CrTe_(2)heterostructure was epitaxially grown on Al_(2)O_(3)(0001)*** Hall measurements indicate the existence of strong ferromagnetism in this device with the CrTe_(2)thickness down to 10 *** order to investigate its micromagnetic structure,cryogenic magnetic force microscope(MFM)was utilized to measure the magnetic domain evolutions at various temperatures and magnetic *** virgin domain state of the device shows a worm-like magnetic domain structure with the size around 0.6μm-0.8μ*** irregular-shape magnetic domains(>1μm)can be induced and pinned,after the field is increased to coercive field and ramped back to low *** temperature-dependent MFM signals exhibit a nice mean-field-like ferromagnetic transition with Curie temperature around 201.5 K,indicating a robust ferromagnetic *** a device can be potentially implemented in future magnetic memory technology.

关键词： CrTe_(2) magnetic domain magnetic force microscopy

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Support vector regression-based operational effectiveness evaluation approach to reconnaissance satellite system

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1626-1644页

作者： HAN Chi XIONG Wei XIONG Minghui LIU Zhen College of Aerospace Information Space Engineering UniversityBeijing 101400China Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering UniversityBeijing 101400China

As one of the most important part of weapon system of systems(WSoS),quantitative evaluation of reconnaissance satellite system(RSS)is indispensable during its construction and *** at the problem of nonlinear effectiveness evaluation under small sample conditions,we propose an evaluation method based on support vector regression(SVR)to effectively address the defects of traditional *** the performance of SVR is influenced by the penalty factor,kernel type,and other parameters deeply,the improved grey wolf optimizer(IGWO)is employed for parameter *** the proposed IGWO algorithm,the opposition-based learning strategy is adopted to increase the probability of avoiding the local optima,the mutation operator is used to escape from premature convergence and differential convergence factors are applied to increase the rate of *** experiments of 14 test functions validate the applicability of IGWO algorithm dealing with global *** index system and evaluation method are constructed based on the characteristics of *** validate the proposed IGWO-SVR evaluation method,eight benchmark data sets and combat simulation are employed to estimate the evaluation accuracy,convergence performance and computational *** to the experimental results,the proposed method outperforms several prediction based evaluation methods,verifies the superiority and effectiveness in RSS operational effectiveness evaluation.

关键词： reconnaissance satellite system(RSS) support vector regression(SVR) gray wolf optimizer opposition-based learning parameter optimization effectiveness evaluation

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Dipolar Bose gas with SU(3)spin-orbit coupling held under a toroidal trap

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Frontiers of physics 2025年第2期20卷 191-200页

作者： Fang Wang Jia Liu Si-Lin Chen Lin Wen Xue-Ying Yang Xiao-Fei Zhang School of Physics&Information Science Shaanxi University of Science and TechnologyXi’an 710021China Shaanxi Key Laboratory for Theoretical Physics Frontiers Institute of Modern PhysicsNorthwest UniversityXi’an 710127China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 400047China College of Sciences National University of Defense TechnologyChangsha 410073China

We consider a dipolar spin-1 Bose gas with SU(3)spin-orbit coupling trapped in a two-dimensional toroidal *** to the combined effects of SU(3)spin-orbit coupling,dipole-dipole interaction,and spin-exchange interaction,the system exhibits a rich variety of ground-state phases and topological defects,including modified stripe,azimuthal distributed petal and triangular lattice,double-quantum spin vortices,and so *** particular,by studying the spin texture of such a system,it is found that the formation and transformation between meron and skyrmion topological spin textures can be realized by a choice of dipole-dipole interaction,SU(3)spin-orbit coupling,and spin-exchange *** also give an experimental protocol to observe such novel states within current experimental capacity.

关键词： Bose-Einstein condensate spin-orbit coupling dipolar condensate quantum vortex

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