Vortex chains induced by anisotropic spin-orbit coupling and magnetic field in spin-2 Bose-Einstein condensates

2021 ◽  
Author(s):  
Hao Zhu ◽  
Shou-Gen Yin ◽  
Wu-Ming Liu
Keyword(s):  
Magnetic Field ◽  
Momentum Distribution ◽  
Physical Nature ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Atomic Interactions ◽  
Vortex Chain ◽  
Bose Einstein ◽  
The Magnetic Field

Abstract We investigate the anisotropic spin-orbit coupled spin-2 Bose-Einstein condensates with Ioffe-Pritchard magnetic field. With nonzero magnetic field, anisotropic spin-orbit coupling will introduce several vortices and further generate a vortex chain. Inside the vortex chain, vortices connect to each other, forming a line along the axis. The physical nature of the vortex chain can be explained by the particle current and the momentum distribution. The vortex number inside the vortex chain can be influenced via varying the magnetic field. Through adjusting the anisotropy of the spin-orbit coupling, the direction of the vortex chain is changed, and the vortex lattice can be triggered. Moreover, accompanied by the variation of the atomic interactions, the density and the momentum distribution of the vortex chain are affected. The realization and the detection of the vortex chain are compatible with current experimental techniques.

Manipulating Vortices in F=2 Bose-Einstein Condensates through Magnetic Field and Spin-Orbit Coupling

2021 ◽  
Author(s):  
Hao Zhu ◽  
Shou-Gen Yin ◽  
Wu-Ming Liu
Keyword(s):  
Magnetic Field ◽  
Phase Separation ◽  
Ground State ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Topological Excitations ◽  
Coupling Strengths ◽  
Bose Einstein ◽  
Particle Current

Abstract We investigate the vortex structures excited by Ioffe-Pritchard magnetic field and Dresselhaus-type spin-orbit coupling in F = 2 ferromagnetic Bose-Einstein condensates. In the weakly interatomic interacting regime, an external magnetic field can generate a polar-core vortex in which the canonical particle current is zero. With 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 anticlockwise. For fixed spin-orbit coupling strengths, the evolution of phase winding, magnetization and degree of phase separation with magnetic field are studied. Additionally, with further increasing spin-orbit coupling strength, the condensate exhibits symmetrical density domains separated by radial vortex arrays. Our work paves the way to explore exotic topological excitations in high-spin system.

scholarly journals SU(3) Spin–Orbit Coupled Rotating Bose–Einstein Condensate Subject to a Gradient Magnetic Field

2021 ◽  
Vol 9 ◽  
Author(s):  
Guang-Ping Chen ◽  
Pu Tu ◽  
Chang-Bing Qiao ◽  
Jin-Xia Zhu ◽  
Qi Jia ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Einstein Condensate ◽  
Orbit Coupling ◽  
Ground State Structure ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
State Structure ◽  
Gradient Magnetic Field ◽  
Bose Einstein Condensate ◽  
Bose Einstein

We consider a harmonically trapped rotating spin-1 Bose–Einstein condensate with SU(3) spin–orbit coupling subject to a gradient magnetic field. The effects of SU(3) spin–orbit coupling, rotation, and gradient magnetic field on the ground-state structure of the system are investigated in detail. Our results show that the interplay among SU(3) spin–orbit coupling, rotation, and gradient magnetic field can result in a variety of ground states, such as a vortex ring and clover-type structure. The numerical results agree well with our variational analysis results.

scholarly journals Anisotropic magnetoresistance in spin–orbit semimetal $${\hbox {SrIrO}}_{3}$$

2020 ◽  
Vol 135 (8) ◽  
Author(s):  
Dirk J. Groenendijk ◽  
Nicola Manca ◽  
Joeri de Bruijckere ◽  
Ana Mafalda R. V. L. Monteiro ◽  
Rocco Gaudenzi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Three Dimensional ◽  
Coulomb Repulsion ◽  
Critical Magnetic Field ◽  
Orbit Coupling ◽  
Anisotropic Magnetoresistance ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Field Orientation ◽  
The Magnetic Field

Abstract$${\hbox {SrIrO}}_{3}$$ SrIrO 3 , the three-dimensional member of the Ruddlesden–Popper iridates, is a paramagnetic semimetal characterised by a the delicate interplay between spin–orbit coupling and Coulomb repulsion. In this work, we study the anisotropic magnetoresistance (AMR) of $${\hbox {SrIrO}}_{3}$$ SrIrO 3 thin films, which is closely linked to spin–orbit coupling and probes correlations between electronic transport, magnetic order and orbital states. We show that the low-temperature negative magnetoresistance is anisotropic with respect to the magnetic field orientation, and its angular dependence reveals the appearance of a fourfold symmetric component above a critical magnetic field. We show that this AMR component is of magnetocrystalline origin, and attribute the observed transition to a field-induced magnetic state in $${\hbox {SrIrO}}_{3}$$ SrIrO 3 .

Exotic States Emerged By Spin-Orbit Coupling, Lattice Modulation and Magnetic Field in Lieb Nano-ribbons

2019 ◽  
Vol 29 (3SI) ◽  
pp. 293 ◽  
Author(s):  
Nguyen Duong Bo ◽  
Nguyen Hong Son ◽  
Tran Minh Tien
Keyword(s):  
Magnetic Field ◽  
Ground State ◽  
The Other ◽  
Orbit Coupling ◽  
Spin Component ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Half Metallic ◽  
Lieb Lattice ◽  
The Magnetic Field

The Lieb nano-ribons with the spin-orbit coupling, the lattice modulation and the magnetic field are exactly studied. They are constructed from the Lieb lattice with two open boundaries in a direction. The interplay between the spin-orbit coupling, the lattice modulation and the magnetic field emerges various exotic ground states. With certain conditions of the spin-orbit coupling, the lattice modulation, the magnetic field and filling the ground state becomes half metallic or half topological. In the half metallic ground state, one spin component is metallic, while the other spin component is insulating. In the half topological ground state, one spin component is topological, while the other spin component is topological trivial. The model exhibits very rich phase diagram.

scholarly journals Spin-Orbit Coupling Effects on Transport Properties of Electronic Lieb Lattice in the Presence of Magnetic Field

2021 ◽  
Author(s):  
Elham Sadeghi ◽  
Hamed Rezania
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Temperature Dependence ◽  
Transport Properties ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Lieb Lattice ◽  
Thermal Conductivities

Abstract In this paper, the transport properties of a two-dimensional Lieb lattice that is a line-centered square lattice are investigated in the presence of magnetic field and spin-orbit coupling. Specially, we address the temperature dependence of electrical and thermal conductivities as well as Seebeck coefficient due to spin-orbit interaction. We have exploited Green’s function approach in order to study thermoelectric and transport properties of Lieb lattice in the context of Kane-Mele model Hamiltonian. The results for Seebeck coefficient show the sign of thermopower is positive in the presence of spin-orbit coupling. Also the temperature dependence of transport properties indicates that the increase of spin-orbit coupling leads to decrease thermal conductivity however the decrease of gap 1 parameter causes the reduction of thermal conductivity. There is a peak in temperature dependence of thermal conductivity for all values of magnetic fields and spin-orbit coupling strengths. Both electrical and thermal conductivities increase with increasing the temperature at low amounts of temperature due to the increasing of transition rate of charge carriers and excitation of them to the conduction bands. Also we have studied the temperature dependence of spin susceptibility of Lieb monolayer due to both spin orbit coupling and magnetic field factors in details.

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