SU(3) spin–orbit-coupled Bose–Einstein condensate confined in a harmonic plus quartic trap  

作　　者：Hao Li Fanglin Chen 李昊;陈方林(School of Mechanical and Electrical Engineering and Information Engineering, University of Mining and Technology, Beijing 100083, China;College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China)

机构地区：[1]School of Mechanical and Electrical Engineering and Information Engineering, University of Mining and Technology, Beijing 100083, China [2]College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China

出　　处：《Chinese Physics B》2019年第7期131-136,共6页中国物理B（英文版）

摘　　要：We consider a SU(3) spin–orbit coupled Bose–Einstein condensate confined in a harmonic plus quartic trap.The ground-state wave functions of such a system are obtained by minimizing the Gross–Pitaevskii energy functional, and the effects of the spin-dependent interaction and spin–orbit coupling are investigated in detail.For the case of ferromagnetic spin interaction, the SU(3) spin–orbit coupling induces a threefold-degenerate plane wave ground state with nontrivial spin texture.For the case of antiferromagnetic spin interaction, the system shows phase separation for weak SU(3) spin–orbit coupling, where three discrete minima with unequal weights in momentum space are selected, while hexagonal honeycomb lattice structure for strong SU(3) SOC, where three discrete minima with equal weights are selected.We consider a SU(3) spin–orbit coupled Bose–Einstein condensate confined in a harmonic plus quartic trap.The ground-state wave functions of such a system are obtained by minimizing the Gross–Pitaevskii energy functional, and the effects of the spin-dependent interaction and spin–orbit coupling are investigated in detail.For the case of ferromagnetic spin interaction, the SU(3) spin–orbit coupling induces a threefold-degenerate plane wave ground state with nontrivial spin texture.For the case of antiferromagnetic spin interaction, the system shows phase separation for weak SU(3) spin–orbit coupling, where three discrete minima with unequal weights in momentum space are selected, while hexagonal honeycomb lattice structure for strong SU(3) SOC, where three discrete minima with equal weights are selected.

关 键 词：BOSE-EINSTEIN CONDENSATE SU(3) spin–orbit coupling Gross–Pitaevskii equation 

分 类 号：O469[理学—凝聚态物理]