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fluctuations of Entanglement Entropy in Noninertial Frames

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Communications in Theoretical Physics 2014年第9期61卷 327-330页

作者：温翠红王接词 College of Electrical and Information engineering Hunan University Department of Physics and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal University

The fluctuation and relative fluctuation of entanglement entropy of a bipartite system for Dirac fields in noninertial frames are investigated. It is shown that the fluctuation and relative fluctuation of entanglement entropy are observer-dependent, which depend on their observed frames. It is found that both the fluctuation and relative fluctuation of entanglement entropy become more noticeable with the increasing of the subsystem's acceleration. We also find that the entanglement entropy always has fluctuation regardless of the initial state parameter and for any magnitude of the acceleration. We argue that the statistical mean for the measurement of entanglement entropy relates to the accelerated motion of the observer.

关键词： entanglement entropy Unruh effect fluctuations Dirac fields

fluctuations　of　peak　energy　and　peak　frequency　of　local　wavelet　energy　spectrum　for　wind　waves

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Acta Oceanologica Sinica 1997年第4期16卷 429-439页

作者： Wu, Kejian Lou, Shunli Institute of Physical Oceanography Ocean University of Qingdao Qingdao 266003 China Laboratory of Physical Oceanography Ocean University of Qingdao Qingdao 266003 China

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关键词： peak spectrum wind fluctuations

Particle–hole fluctuations and possible superconductivity in doped α-RuCl_3

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Chinese Physics B 2019年第5期28卷 282-287页

作者： Bin-Bin Wang Wei Wang Shun-Li Yu Jian-Xin Li National Laboratory of Solid State Microstructures and Department of Physics Nanjing University

We study various particle–hole excitations and possible superconducting pairings mediated by these fluctuations in doped α-RuCl_3 by using multi-band Hubbard model with all t_(2g) orbitals. By performing a random-phase-approximation(RPA) analysis, we find that among all particle–hole excitations, the j_(eff)= 1/2 pseudospin fluctuations are dominant, suggesting the robustness of j_(eff)= 1/2 picture even in the doped systems. We also find that the most favorable superconducting state has a d-wave pairing symmetry.

关键词： superconductivity particle–hole fluctuations spin–orbit coupling α-RuCl3

Annealing-induced long-range charge density wave order in magnetic kagome FeGe:fluctuations and disordered structure

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 112-121页

作者： Chenfei Shi Yi Liu Bishal Baran Maity Qi Wang Surya Rohith Kotla Sitaram Ramakrishnan Claudio Eisele Harshit Agarwal Leila Noohinejad Qian Tao Baojuan Kang Zhefeng Lou Xiaohui Yang Yanpeng Qi Xiao Lin Zhu-An Xu Arumugam Thamizhavel Guang-Han Cao Sander Van Smaalen Shixun Cao Jin-Ke Bao Department of Physics Materials Genome InstituteInstitute for Quantum Science and TechnologyShanghai UniversityShanghai 200444China Key Laboratory of Quantum Precision Measurement of Zhejiang Province School of PhysicsZhejiang University of TechnologyHangzhou 310023China School of Physics Zhejiang UniversityHangzhou 310027China Department of Condensed Matter Physics and Materials Science Tata Institute of Fundamental ResearchMumbai 400005India School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Laboratory of Crystallography University of BayreuthBayreuth 95447Germany Department of Quantum Matter AdSEHiroshima UniversityHigashi-Hiroshima 739-8530Japan P24 PETRA IIIDeutsches Elektronen-Synchrotron DESYHamburg 22607Germany Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Department of Physics China Jiliang UniversityHangzhou 310018China Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjing 210093China Shanghai Key Laboratory of High Temperature Superconductors Shanghai UniversityShanghai 200444China School of Physics Hangzhou Normal UniversityHangzhou 311121China

Charge density wave(CDW) in kagome materials with the geometric frustration is able to carry unconventional ***, a CDW has been observed below the antiferromagnetic order in kagome FeGe, in which magnetism and CDW are intertwined to form an emergent quantum ground state. However, the CDW is only short-ranged and the structural modulation originating from it has yet to be determined experimentally. Here we realize a long-range CDW order by post-annealing process,and resolve the structure model through single crystal X-ray diffraction. Occupational disorder of Ge resulting from short-range CDW correlations above T_(CDW) is identified from structure refinements. The partial dimerization of Ge along the c axis is unveiled to be the dominant distortion for the CDW. Occupational disorder of Ge is also proved to exist in the CDW phase due to the random selection of partially dimerized Ge sites. Our work provides useful insights for understanding the unconventional nature of the CDW in FeGe.

关键词： charge density wave kagome disordered structure fluctuations

Features in Quasi—particle Excitations and Tunnelling Spectra due to Coupling to Spin fluctuations in High—Tc Cuprates

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Chinese Physics Letters 2002年第7期19卷 992-995页

作者：赵力李建新等 NationalLaboratoryofSuperconductivity InstituteofPhysicsChineseAcademyofSciencesBijing100080 NationalLaboratoryofSolidstatesofMicrostructureandDepartmentofPhysics NanjingUnivers

In a self-consistent mean-field treatment of the two-dimensional t-t'-J model, we theoretically examine the coupling of in-plane quasi-particles to the antiferromagnetic spin fluctuations in high-Tc superconductors, which renormalizes the fermionic self-energy. We reproduce the characteristic peak-dip-hump structure observed not only in angle-resolved photoemission spectroscopy, but also in superconductor-insulator-normal metal junctions and scanning tunnelling microscopy experiments. We consider the evolution of this structure with doping. It is shown that this kind of coupling can account for many anomalous properties of high-Tc superconductors in superconducting states.

关键词： Scanning Tunneling Microscope coupling Excitation Spin fluctuations Tunneling fluctuations Couplings superconducting state

Modification of Boundary fluctuations by LHCD in the HT—7 Tokamak

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Chinese Physics Letters 2003年第6期20卷 865-868页

作者： SONGMei WANBao-Nian XUGuo-Sheng LINGBi-Li InstituteofPlasmaPhysics ChineseAcademyofSciencesPOBox1126Hefei230031

Measurements of boundary fluctuations and fluctuation driven electron fluxes have been performed in ohmic and lower hybrid current drive enhanced confinement plasma using a graphite Langmuir probe array on HT-7 tokamak. The fluctuations are significantly suppressed and the turbulent fluxes are remarkably depressed in the enhanced plasma. We characterized the statistical properties of fluctuations and the particle flux and found a non-Gaussian character in the whole scrape-off layer with minimum deviations from Gaussian in the proximity of the velocity shear layer in ohmic plasma. In the enhanced plasma the deviations in the boundary region are all reduces obviously. The fluctuations and induced electron fluxes show sporadic bursts asymmetric in time and the asymmetry is remarkably weakened in the lower hybrid current driving (LHCD) phase. The results suggest a coupling between the statistical behaviour of fluctuations and the turbulent flow.

关键词： Ohmic current drive HT-7 TOKAMAK boundary regions Particle Flux Turbulent Flow Non-Gaussian fluctuations SHEAR VELOCITY Tokamak devices Electron Flux MODIFICATION

A Quasi-1D Potential for Bose Gas Phase fluctuations

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Chinese Physics Letters 2019年第8期36卷 10-13页

作者： Shi-Feng Yang Zi-Tong Xu Kai Wang Xiu-Fei Li Yue-Yang Zhai Xu-Zong Chen School of Electronics Engineering and Computer Science Peking UniversityBeijing100871 Science and Technology on Inertial Laboratory Beihang UniversityBeijing100191 Beijing Academy of Quantum Information Sciences Beijing100193 Beijing Advanced Innovation Center for Big Data-Based Precision Medicine Beijing100191

An elongated trap potential for cold atoms is designed based on a quadrupole-Ioffe *** fluctuations in a Bose-Einstein condensate(BEC),which is confined by the trap,are *** simulate the atom density distribution induced by fluctuation after time of flight from this elongated trap potential and study the temperature measurement method related to the ***,taking advantage of the tight confinement and radio frequency dressing technique,we propose a double well potential for splitting *** results are helpful for improving understanding of low-dimensional quantum gases and provide important guidance for atomic interferometry.

关键词： Bose Gas Phase fluctuations

Impact of seasonal water-level fluctuations on autumn vegetation in Poyang Lake wetland,China

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Frontiers of Earth Science 2019年第2期13卷 398-409页

作者： Xue DAI Rongrong WAN Guishan YANG Xiaolong WANG Ligang XU Yanyan LI Bing LI Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 21000& China University of Chinese Academy of Sciences Beijing 100049China Jiangsu Second Normal University Nanjing 210013China

Water level fluctuations (WLF) are natural patterns that are necessary for the survival of various plants,and WLF guarantee both the productivity and the biodiversity of ***,the underlying mechanisms of how changes in vegetation are linked to seasonal WLF remain *** vegetation and hydrological data from 1989 to 2009,we identified the key seasonal fluctuations and their impacts on vegetation in the Poyang Lake wetland by utilizing a tree-based hierarchical *** to our results: 1) WLF in summer had significant impacts on both sedges and *** severe summer floods promoted the expansion of sedges,while they inhibited the expansion of reeds;2) WLF in autumn also greatly impacted sedges,while reeds were severely affected in ***,we found that low water levels in autumn led to the expansion of sedges,and low water levels in spring led to the expansion of *** results were well corroborated through comparisons of the vegetation distribution patterns over the last two decades (i.e.,the 1990s and 2000s),which may shed light on corresponding water resource and wetland management.

关键词： wetland reeds sedges seasonal water-level fluctuations classification and regression tree model

Energy and Heat fluctuations in a Temperature Quench

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Communications in Theoretical Physics 2014年第10期61卷 555-570页

作者： M.Zannetti F.Corberi G.Gonnella A.Piscitelli Dipartimento di Fisica "E.Caianiello" and CNISMUnità di SalernoUniversità di Salernovia Giovanni Paolo II 13284084 Fisciano (SA)Italy Kavli Institute for Theoretical Physics China the Chinese Academy of Sciences Dipartimento di Fisica Università di Bari and INFNSezione di Barivia Amendola 17370126 BariItaly Division of Physical Sciences School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang Link637371Singapore

fluctuations of energy and heat are investigated during the relaxation following the instantaneous temperature quench of an extended system. Results are obtained analytically for the Gaussian model and for the large N model quenched below the critical temperature TC. The main finding is that fluctuations exceeding a critical threshold do condense. Though driven by a mechanism similar to that of Bose–Einstein condensation, this phenomenon is an out-of-equilibrium feature produced by the breaking of energy equipartition occurring in the transient regime. The dynamical nature of the transition is illustrated by phase diagrams extending in the time direction.

关键词： fluctuations condensation temperature quench relaxation equipartition breaking