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Tunable ground-state solitons in spin–orbit coupling Bose–Einstein condensates in the presence of optical lattices

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Chinese Physics B 2017年第8期26卷 54-60页

作者：张华峰陈方郁春潮孙利辉徐大海 Institute of Quantum Optics and Information Photonics Yangtze UniversityJingzhou 434023China School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China

Properties of the ground-state solitons, which exist in the spin-orbit coupling （SOC） Bose-Einstein condensates （BEC） in the presence of optical lattices, are presented. Results show that several system parameters, such as SOC strength, lattice depth, and lattice frequency, have important influences on properties of ground state solitons in SOC BEC. By controlling these parameters, structure and spin polarization of the ground-state solitons can be effectively tuned, so ma- nipulation of atoms may be realized.

关键词： spin-orbit coupling Bose-Einstein condensates optical lattices

spin-orbit coupling modification of photons to ray equation in inhomogeneous medium

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Journal of Shanghai University(English Edition) 2011年第6期15卷 529-534页

作者：钟芳季沛勇 Department of Physics College of SciencesShanghai University

Based on the principle of general relativity,geometrization of interaction,the interaction of the inhomogeneous isotropic medium to light can be equated to a non-Euclidean geometry field just like the situation of gravity,i.e.,light travels in the null geodesic in the non-Euclidean curved space-time,which is equivalent to the Fermat principle for the inhomogeneous *** this paper,the propagation of light in an inhomogeneous media is studied by means of the effective metric *** modification to the classical ray equation of photons is derived from the geodesic equation of photon by considering the spin effect of photons,which is induced via the spin-orbit coupling of photons,and the corresponding Hamiltonian of photonis *** on the spin-orbit coupling of photon,a light splitting phenomenon emerges in the inhomogeneous media,which is the spin hall effect of photon.

关键词： spin-orbit coupling spin hall effect ray equation

spin-dependent electron transport of a waveguide with Rashba spin-orbit coupling in an electromagnetic field

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Chinese Physics B 2009年第12期18卷 5462-5467页

作者：肖贤波李小毛陈宇光 Department of Physics Tongji University College of Science Jiangxi Agricultural University

We investigate theoretically the spin-dependent electron transport in a straight waveguide with Rashba spin-orbit coupling （SOC） under the irradiation of a transversely polarized electromagnetic （EM） field. spin-dependent electron conductance and spin polarization are calculated as functions of the emitting energy of electrons or the strength of the EM field by adopting the mode matching approach. It is shown that the spin polarization can be manipulated by external parameters when the strength of Rashba SOC is strong. Furthermore, a sharp step structure is found to exist in the total electron conductance. These results can he understood by the nontrivial Rashba subbands intermixing and the electron intersubband transition when a finite-range transversely polarized EM field irradiates a straight waveguide.

关键词： waveguide spin-orbit coupling spin polarization

Weakly interacting spinor Bose–Einstein condensates with three-dimensional spin–orbit coupling

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Chinese Physics B 2016年第4期25卷 63-68页

作者：宋淑伟孙蕊赵洪王暄韩宝忠 State Key Laboratory Breeding Base of Dielectrics Engineering Harbin University of Science and Technology Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology College of Electrical and Electronic Engineering Harbin University of Science and Technology

Starting from the Hamiltonian of the second quantization form, the weakly interacting Bose-Einstein condensate with spin--orbit coupling of Weyl type is investigated. It is found that the SU（2） nonsymmetric term, i.e., the spin-dependent interaction, can lift the degeneracy of the ground states with respect to the z component of the total angular momentum Jz, casting the ground condensate state into a configuration of zero Jz. This ground state density profile can also be affirmed by minimizing the full Gross-Pitaevskii energy functional. The spin texture of the zero Jz state indicates that it is a knot structure, whose fundamental group is 7173 （M） ≌π3 （S2） = Z.

关键词： Bose-Einstein condensate spin-orbit coupling knot

Manipulating vortices in F=2 Bose-Einstein condensates through magnetic field and spin-orbit coupling

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Chinese Physics B 2022年第4期31卷 151-156页

作者： Hao Zhu Shou-Gen Yin Wu-Ming Liu Key Laboratory of Display Materials and Photoelectric Devices(Ministry of Education) Tianjin Key Laboratory for Photoelectric Materials and DevicesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

We investigate the vortex structures excited by Ioffe-Pritchard magnetic field and Dresselhaus-type spin-orbit coupling in F=2 ferromagnetic Bose-Einstein *** the weakly interatomic interacting regime,an external magnetic field can generate a polar-core vortex in which the canonical particle current is *** the combined effect of spin-orbit coupling and magnetic field,the ground state experiences a transition from polar-core vortex to Mermin-Ho vortex,in which the canonical particle current is *** fixed spin-orbit coupling strengths,the evolution of phase winding,magnetization,and degree of phase separation with magnetic field are ***,with further increasing spin-orbit coupling strength,the condensate exhibits symmetrical density domains separated by radial vortex *** work paves the way to explore exotic topological excitations in high-spin systems.

关键词： Bose-Einstein condensates vortex magnetic field spin-orbit coupling

Mitigating the Jahn-Teller distortion driven by the spin-orbit coupling of lithium manganate cathode

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Journal of Energy Chemistry 2022年第9期31卷 379-387,I0011页

作者： Shu Zhang Hongyi Chen Jun Chen Shouyi Yin Yu Mei Lianshan Ni Andi Di Wentao Deng Guoqiang Zou Hongshuai Hou Xiaobo Ji State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina Department of Materials and Environmental Chemistry Stockholm UniversityStockholm 10691Sweden

spinel LiMn_(2)O_(4)is recognized as one of the most competitive cathode candidates for lithium-ion batteries ascribed to environmentally benign and rich ***,the wholesale application of LiMn_(2)O_(4)is predominately plagued by its severe capacity degradation,mainly associated with the innate Jahn-Teller ***,single-crystalline LiMn_(2)O_(4)with Eu^(3+) doping is rationally designed to mitigate the detrimental Jahn-Teller distortion by tuning the chemical environment of MnO_(6) octahedra and accommodating localized electron,based on the unique aspheric flexible 4f electron orbit of rare-earth metal ***,the stretching of MnO_(6) octahedron stemmed from the Jahn-Teller effect in Eu-doped LiMn_(2)O_(4)is effectively suppressed,confirmed by theoretical ***,the structural stability of the material has been significantly enhanced due to the robust Mn–O band coherency and weakened phase transition,proved by synchrotron radiation absorption spectrum and operando X-ray *** corresponding active cathode manifests superior long-cycle stability after 300 loops at 2C and displays only a 0.011%capacity drop per cycle even at *** this,this modification tactic sheds new light on achieving superior long-cycle performances by suppressing distortion in various cathode materials.

关键词： spinel lithium manganate spin-orbit coupling Jahn-Teller distortion Cathode material

Field-assisted electron transport through a symmetric double-well structure with spin-orbit coupling and the Fano-resonance induced spin filtering

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Chinese Physics B 2008年第7期17卷 2670-2677页

作者：张存喜聂一行梁九卿 Department of Physics and Institute of Theoretical Physics Shanxi University Department of Physics Yanbei Normal Institute

We have investigated theoretically the field-driven electron-transport through a double-quantum-well semiconductor-heterostructure with spin-orbit coupling. The numerical results demonstrate that the transmission spectra are divided into two sets due to the bound-state level-splitting and each set contains two asymmetric resonance peaks which may be selectively suppressed by changing the difference in phase between two driving fields. When the phase difference changes from 0 to π, the dip of asymmetric resonance shifts from one side of resonance peak to the other side and the asymmetric Fano resonance degenerates into the symmetric Breit-Wigner resonance at a critical value of phase difference. Within a given range of incident electron energy, the spin polarization of transmission current is completely governed by the phase difference which may be used to realize the tunable spin filtering.

关键词： Fano effect Floquet channel spin-orbit coupling

Topological superfluid in a two-dimensional polarized Fermi gas with spin-orbit coupling and adiabatic rotation

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Chinese Physics B 2017年第12期26卷 118-123页

作者：乔雷迟诚 School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China

We study the properties of superfluid in a two-dimensional （2D） polarized Fermi gas with spin-orbit coupling and adiabatic rotation which are trapped in a harmonic potential. Due to the competition between polarization, spin-orbit coupling, and adiabatic rotation, the Fermi gas exhibits many intriguing phenomena. By using the Bardeen-Cooper-Schrieffer （BCS） mean-field method with local density approximation, we investigate the dependence of order parameter solution on the spin-orbit coupling strength and the rotation velocity. The energy spectra with different rotation velocities are studied in detail. Besides, the conditions for the zero-energy Majorana fermions in topological superfluid phase to be observed are obtained. By investigating distributions of number density, we find that the rotation has opposite effect on the distribution of number density with different spins, which leads to the enhancement of the polarization of Fermi gas. Here, we focus on the region of BCS pairing and ignore the Fulde-Ferrell-Larkin-Ovchinnikov state.

关键词： topological superfluid BCS mean field spin-orbit coupling polarized Fermi gas

Influence of spin–orbit coupling on spin-polarized electronic transport in magnetic semiconductor nanowires with nanosized sharp domain walls

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Chinese Physics B 2018年第4期27卷 384-390页

作者： Lian Liu Wen-Xiang Chen Rui-Qiang Wang Liang-Bin Hu Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510631 China

Influence of spin–orbit coupling on spin-polarized electronic transport in magnetic semiconductor nanowires with nanosized sharp domain walls is investigated *** is shown that the Rashba spin–orbit coupling can enhance significantly the spin-flip scattering of charge carriers from a nanosized sharp domain wall whose extension is much smaller than the carrier＇s Fermi *** there are more than one domain wall presented in a magnetic semiconductor nanowire,not only the spin-flip scattering of charge carriers from the domain walls but the quantum interference of charge carriers in the intermediate domain regions between neighboring domain walls may play important roles on spin-polarized electronic transport,and in such cases the influences of the Rashba spin–orbit coupling will depend sensitively both on the domain walls＇ width and the domain walls＇ separation.

关键词： magnetic semiconductor nanowires domain wall spin-orbit coupling spin-polarized electronic transport