Phase diagram and collective modes in Rashba spin–orbit coupled BEC: Effect of in-plane magnetic field  

作　　者：董冬 邹旭波 郭光灿 

机构地区：[1]Key Laboratory of Quantum Information,University of Science and Technology of China

出　　处：《Chinese Physics B》2015年第7期387-391,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.10774088)

摘　　要：We studied the system of pure Rashba spin–orbit coupled Bose gas with an in-plane magnetic field. Based on the mean field theory, we obtained the zero temperature phase diagram of the system which exhibits three phases, plane wave（PW） phase, striped wave（SW） phase, and zero momentum（ZM） phase. It was shown that with a growing in-plane field,both SW and ZM phases will eventually turn into the PW phase. Furthermore, we adopted the Bogoliubov theory to study the excitation spectrum as well as the sound speed.We studied the system of pure Rashba spin–orbit coupled Bose gas with an in-plane magnetic field. Based on the mean field theory, we obtained the zero temperature phase diagram of the system which exhibits three phases, plane wave（PW） phase, striped wave（SW） phase, and zero momentum（ZM） phase. It was shown that with a growing in-plane field,both SW and ZM phases will eventually turn into the PW phase. Furthermore, we adopted the Bogoliubov theory to study the excitation spectrum as well as the sound speed.

关 键 词：Rashba spin–orbit coupling excitation spectrum in-plane magnetic field 

分 类 号：O469[理学—凝聚态物理] O482.5[理学—电子物理学]