山西大学学报（自然科学版）2017，Vol.40Issue(2)：300-304,5.DOI:10.13451/j.cnki.shanxi.univ(nat.sci.).2017.02.015
自旋轨道耦合驱动下二维质量不相等费米气体的拓扑相
Topological Phase in a Two-dimensional Mass-imbalanced Fermi Gases Driven by Spin-orbit Coupling
摘要
Abstract
We use the mean-field theory to investigate zero temperature characteristic in a two-dimensional (2-D) mass-imbalanced Fermi gases with equal-Rashba-Dresselhaus (ERD) spin-orbit coupling (SOC) and Zeeman field.The system exists three topologically distinct superfluid phases (US-0 phase,US-1 phase,US-2 phase).Through analying the gap and atom number equations numerically,we find that superfluid order parameter can be suppressed more stronger by a Zeeman field as the mass difference increases.With increasing SOC,the weak atractive interaction region of the US-2 phase shrinks.When there is a finite SOC of the ERD type,0＜λ＜1,only in the weak atractive interaction region US-2 topologically superfluid phases exists;λ＞1,in weak and strong atractive interaction region US-2 topologically superfluid phases exists.关键词
费米气体/自旋轨道耦合(SOC)/质量不相等/拓扑相Key words
Fermi gases/spin-orbit coupling (SOC)/mass-imbalanced/topological phase分类
数理科学引用本文复制引用
张鹏,梁军军..自旋轨道耦合驱动下二维质量不相等费米气体的拓扑相[J].山西大学学报（自然科学版）,2017,40(2):300-304,5.基金项目
国家自然科学基金(11005071) （11005071）
