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.

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

2017 ◽  
Vol 26 (8) ◽  
pp. 080304
Author(s):  
Huafeng Zhang ◽  
Fang Chen ◽  
Chunchao Yu ◽  
Lihui Sun ◽  
Dahai Xu
Keyword(s):  
Ground State ◽  
Optical Lattices ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Bose Einstein

Influence of magnetic field and Rashba spin–orbit coupling on strong-coupling magnetopolarons in quantum disks

2014 ◽  
Vol 28 (27) ◽  
pp. 1450185
Author(s):  
Wei Xin ◽  
Chao Han ◽  
Eerdunchaolu
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Interaction Energy ◽  
Ground State ◽  
State Interaction ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Phonon Interaction ◽  
Rashba Spin

On the basis of Lee–Low–Pines (LLP) unitary transformation, the influence of external magnetic field, Rashba spin–orbit coupling and quantum size effect on the ground-state interaction energy of strong-coupling magnetopolarons in quantum disks (QDs) is studied by using the Tokuda improved linear combine operator method. The results show that the ground-state interaction energy of magnetopolarons consists of four parts: the energy caused by the confinement potential of QDs, interaction energy between the electron and external magnetic field, electron and longitudinal-optical (LO) phonon interaction energy and additional term of Rashba effect originating from phonons. The electron–LO phonon interaction energy Ee- ph and additional term of Rashba effect are always negative; the absolute value |Ee- ph | increases with increasing transverse confinement strength ω0, cyclotron frequency of external magnetic field ωc and electron–LO phonon coupling strength α, but decreases with increasing the thickness of QDs L; the state properties of magnetopolarons are closely linked with the sign of the ground-state interaction energy of magnetopolarons E int and change of E int with ωc, ω0, α and L. In addition, the vibration frequency of magnetopolarons λ increases with increasing ωc, ω0 and α, but decreases with increasing L. For the ground state of magnetopolarons in QDs, the electron–LO phonon interaction plays a significant role, meanwhile, the influence of Rashba spin–orbit coupling effect cannot be ignored.

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.

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.

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.

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