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Evidence for distortion-induced local electric polarization in α-RuCl3

Science China(physics,Mechanics & Astronomy) 2024年第9期Mechanics & Astronomy) .卷 169-177页

作者： Xinrun Mi De Hou Xiao Wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of physics Center of Quantum Materials and DevicesChongqing University Anhui Key Laboratory of Condensed Matter physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceAnhuiChinese Academy of Sciences University of Science and Technology of China jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum(jCNS-MLZ) Forschungszentrum Jülich GmbH School of physics Beihang University Analytical and Testing center Chongqing University State Key Laboratory of Surface physics Department of PhysicsFudan University CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences Ⅱ.Physikalisches Institut Universit?t zu K?ln

The spin-orbit assisted Mott insulator α-RuCl3is a prime candidate for material realization of the Kitaev quantum spin *** little attention has been paid to charge degrees of freedom, charge effects, such as electric polarization, may arise in this system. Here, we report distortion-induced local electric polarization in α-RuCl3as evidenced by single-crystal X-ray diffraction,second harmonic generation（SHG） and dielectric measurements. The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play. Despite sizable pyroelectric currents in the Kitaev paramagnetic state, the absence of hysteresis in the polarization-electric field（P-E） points to the shortrange nature of electric polarization. This localized electric polarization is likely the result of distortion-induced charge dimerization, achieved through virtual hopping-induced charge redistribution. In addition, the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state. Our results emphasize the importance of charge degrees of freedom in α-RuCl3, which establish a novel platform to investigate charge effects in Kitaev materials.

关键词： Mott insulator Kitaev quantum spin liquid electric polarization

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Impact of T_(i)/T_(e )ratio on ion transport based on EAST H-mode plasmas

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Plasma Science and Technology 2024年第4期26卷 68-78页

作者：刘建文臧庆梁云峰陈佳乐邬潇河 Alexander KNIEPS 扈嘉辉金仡飞张斌储宇奇刘海庆吕波段艳敏李妙辉陈颖杰龚先祖 the EAST Team Institute of Plasma physics Chinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Forschungszentrum jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany

At the EAST tokamak, the ion temperature(T_(i)) is observed to be clamped around 1.25 keV in electron cyclotron resonance(ECR)-heated plasmas, even at core electron temperatures up to 10 keV(depending on the ECR heating power and the plasma density). This clamping results from the lack of direct ion heating and high levels of turbulence-driven transport. Turbulent transport analysis shows that trapped electron mode and electron temperature gradient-driven modes are the most unstable modes in the core of ECR-heated H-mode plasmas. Nevertheless, recently it was found that the T_(i)/T_(e)ratio can increase further with the fraction of the neutral beam injection(NBI) power, which leads to a higher core ion temperature(Ti0). In NBI heating-dominant H-mode plasmas, the ion temperature gradient-driven modes become the most unstable ***, a strong and broad internal transport barrier(ITB) can form at the plasma core in high-power NBI-heated H-mode plasmas when the T_(i)/T_(e)ratio approaches ~1, which results in steep core Teand Tiprofiles, as well as a peaked neprofile. Power balance analysis shows a weaker Teprofile stiffness after the formation of ITBs in the core plasma region, where Ticlamping is broken,and the core Tican increase further above 2 keV, which is 80% higher than the value of Ticlamping in ECR-heated plasmas. This finding proposes a possible solution to the problem of Ticlamping on EAST and demonstrates an advanced operational regime with the formation of a strong and broad ITB for future fusion plasmas dominated by electron heating.

关键词： ion temperature clamping transport neutral beam injection stiffness internal transport barrier

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Critical Opalescence and Its Impact on the jet Quenching Parameter q

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Chinese physics Letters 2024年第3期41卷 23-29页

作者：武警曹杉杉李峰 School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Research center for hadron and CSR physics Lanzhou University and Institute of Modern Physics of CASLanzhou 730000China Lanzhou center for Theoretical physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China Frontiers Science center for Rare Isotopes Lanzhou UniversityLanzhou 730000China

jet quenching parameter q is essential for characterizing the interaction strength between jet partons and nuclear *** on the quark-meson model,we develop a new framework for calculating q at finite chemical potential... 详细信息

关键词： parameter quark calculating

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Evolution of N=20,28,50 shell closures in the 20≤Z≤30 region in deformed relativistic Hartree-Bogoliubov theory in continuum

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Chinese physics C 2024年第1期48卷 144-153页

作者：郑茹尤孙向向申国防耿立升 School of physics Beihang UniversityBeijing102206China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron PhysicsForschungszentrum JülichD-52425 JülichGermany CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Peng Huanwu Collaborative center for Research and Education Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and physics Beihang UniversityBeijing 102206China Southern center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

Magicity,or shell closure,plays an important role in our understanding of complex nuclear *** this work,we employ one of the state-of-the-art density functional theories,the deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)with the density functional PC-PK1,to investigate the evolution of the N=20,28,50 shell closures in the 20≤Z≤30 *** show how these three conventional shell closures evolve from the proton drip line to the neutron drip line by studying the charge radii,two-neutron separation energies,two-neutron gaps,quadrupole deformations,and single-particle *** particular,we find that in the 21≤Z≤27 region,the N=50 shell closure disappears or becomes quenched,mainly due to the deformation ***,both experimental data and theoretical predictions indicate that the N=28 shell closure disappears in the Mn isotopic chain,mainly due to the deformation *** DRHBc theory predicts the existence of the N=20 shell closure in the Ca,Sc,and Ti isotopic chains,but the existing data for the Ti isotopes suggest the contrary,and therefore further research is needed.

关键词： shell evolution covariant density functional theories magic numbers

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Critical Opalescence and Its Impact on the jet Quenching Parameter ■

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Chinese physics Letters 2024年第3期41卷 28-34页

作者：武警曹杉杉李峰 School of Physical Science and Technology Lanzhou University Institute of Frontier and Interdisciplinary Science Shandong University Research center for hadron and CSR physics Lanzhou University and Institute of Modern Physics of CAS Lanzhou center for Theoretical physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare Isotopes Lanzhou University Frontiers Science center for Rare Isotopes Lanzhou University

jet quenching parameter ■ is essential for characterizing the interaction strength between jet partons and nuclear matter. Based on the quark-meson model, we develop a new framework for calculating ■ at finite chemi...

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Evidence for distortion-induced local electric polarization in α-RuCl

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Science China(physics,Mechanics & Astronomy) 2024年

作者： Xinrun Mi De Hou Xiao Wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of physics Center of Quantum Materials and Devices Chongqing University Anhui Key Laboratory of Condensed Matter physics at Extreme Conditions High Magnetic Field Laboratory Hefei Institutes of Physical Science Anhui Chinese Academy of Sciences University of Science and Technology of China jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum (jCNS-MLZ) Forschungszentrum Jülich GmbH School of physics Beihang University Analytical and Testing center Chongqing University State Key Laboratory of Surface physics Department of Physics Fudan University CAS Key Laboratory of Theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences II.Physikalisches Institut Universit?t zu K?ln

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Observational appearances of hairy black holes in the framework of gravitational decoupling

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Communications in Theoretical physics 2024年第8期76卷 105-119页

作者： Yizhi Liang Xin Lyu jun Tao center for Theoretical physics College of Physics Sichuan University

We investigate the observational appearance of static and spherically symmetric hairy black holes in the framework of gravitational decoupling with the weak energy condition(WEC). Two types of thin illumination conditions are studied: spherical accretion and disk accretion. As the hairy parameter increases, the size of the photon sphere and photon rings in both models decreases, and the overall luminosity attenuation becomes more pronounced. In spherical accretion, the luminosity of infalling accretion is significantly lower than that of stationary accretion. In disk accretion the luminosity of the black hole is contributed by direct emission, the lensing ring and the photon ring. Employing four types of astrophysical disk luminosity model,we investigate the appearance of halos and note that their luminosities do not superimpose when the source is on or beyond the innermost stable circular orbit.

关键词： accretion disk gravitational decoupling hairy black hole shadow

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The effect of Laves phases and nano-precipitates on the electrochemical corrosion resistance of Mg-Al-Ca alloys under alkaline conditions

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journal of Magnesium and Alloys 2024年第6期12卷 2447-2461页

作者： Markus Felten Veronika Chaineux Siyuan Zhang Ali Tehranchi Tilmann Hickel Christina Scheu joshua Spille Marta Lipińska-Chwałek joachim Mayer Benjamin Berkels Marcus Hans Imke Greving Silja Flenner Sandra Sefa Daniela Zander Chair of Corrosion and Corrosion Protection RWTH Aachen UniversityAachen 52072 Germany Max-Planck-Institut für Eisenforschung GmbH Düsseldorf 40237 Germany Central Facility for Electron Microscopy RWTH Aachen UniversityAachen 52074 Germany Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons Forschungszentrum Jülich GmbHJülich 52428Germany Mathematical Image and Signal Processing Aachen Institute for Advanced Study in Computational Engineering ScienceRWTH Aachen UniversityAachen 52062 Germany Materials Chemistry RWTH Aachen UniversityAachen 52074 Germany Institute of Materials physics Helmholtz-Zentrum HereonGeesthacht 21502 Germany

The electrochemical corrosion mechanisms of Mg alloys were extensively studied in previous investigations of different chemical com-positions,modified surface states and various electrolyte ***,recent research focused on the active state of Mg dissolution,leading to unresolved effects of secondary phases adjacent to a stableα-solid solution passive *** present study investigates the fundamental electrochemical corrosion mechanisms of three different Laves phases with varying phase morphologies and phase fractions in the passive state of Mg-Al-Ca *** microstructure was characterized by(transmission-)electron microscopy and synchrotron-based transmission X-ray *** electrochemical corrosion resistance was determined with a standard three-electrode setup and advanced in-situ flow cell measurements.A new electrochemical activity sequence(C15>C36>α-Mg>C14)was obtained,as a result of a stable passive layer formation on theα-solid ***,nm-scale Mg-rich precipitates were identified within the Laves phases,which tend to inhibit the corrosion kinetics.

关键词： Laves phase STEM Magnesium Corrosion Passive layer

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Distinguishing the observational signatures of hot spots orbiting Reissner-Nordström spacetime

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Chinese physics C 2024年第7期48卷 221-230页

作者：吴天枢陈一千 center for Theoretical physics College of PhysicsSichuan UniversityChengdu 610064China

This paper investigates observable signatures of hot spots orbiting Reissner-Nordström(RN)black holes and naked *** an RN black hole,we find two discernible lensing image tracks in time integrated images,capturing a complete orbit of hot spots and a image shadow within the critical curve where photons with a small impact parameter fall into the event ***,in RN singularities,additional image tracks can be found within the critical curve,originating from photons reflected by the infinitely high effective potential ***,we find incomplete and converging tracks from the time integrated images of hot spot orbiting RN singularities that have no photon *** presence of these additional image tracks significantly influences temporal magnitudes at their local maxima,enabling us to differentiate between RN black holes and RN naked singularities.

关键词： astrometry gravitational lensing black hole physics D0I:10.1088/1674-1137/ad3c2d

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A Composite Ansatz for Calculation of Dynamical Structure Factor

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Chinese physics Letters 2024年第1期41卷 92-103页

作者：张玉佩莫崇杰张平康炜 HEDPS Center for Applied Physics and Technologyand School of PhysicsPeking UniversityBeijing 100871China Beijing Computational Science Research center Beijing 100193China Institute of Applied physics and Computational Mathematics Beijing 100088China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

We propose an ansatz without adjustable parameters for the calculation of a dynamical structure *** ansatz combines the quasi-particle Green’s function,especially the contribution from the renormalization factor,and the exchange-correlation kernel from time-dependent density functional theory together,verified for typical metals and semiconductors from a plasmon excitation regime to the Compton scattering *** has the capability to reconcile both small-angle and large-angle inelastic x-ray scattering(IXS)signals with muchimproved accuracy,which can be used as the theoretical base model,in inversely inferring electronic structures of condensed matter from IXS experimental signals *** may also be used to diagnose thermal parameters,such as temperature and density,of dense plasmas in x-ray Thomson scattering experiments.

关键词： excitation inverse verified

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