深圳大学学报（理工版）
深圳大學學報（理工版）
심수대학학보（리공판）
Journal of Shenzhen University(Science & Engineering)
2015年
5期
449-457
,共9页
凝聚态物理%Fermi-Hubbard模型%光学晶格%Zeeman场%自旋轨道耦合%密度矩阵重整化群%相分离
凝聚態物理%Fermi-Hubbard模型%光學晶格%Zeeman場%自鏇軌道耦閤%密度矩陣重整化群%相分離
응취태물리%Fermi-Hubbard모형%광학정격%Zeeman장%자선궤도우합%밀도구진중정화군%상분리
condensed matter physics%Fermi-Hubbard model%optical lattice%Zeeman field%spin-orbit coupling%density-matrix-renormalization-group ( DMRG)%phase separation
采用密度矩阵重整化群 ( density-matrix-renormalization-group, DMRG) 方法, 研究梯状光晶格中排斥相互作用费米气体的基态属性. 研究表明, Zeeman场能够激发系统的相分离 (完全极化相和部分极化相), 而自旋轨道耦合效应能抑制相分离, 使整个晶格处于部分极化相, 在不同的强弱排斥相互作用系统中, 极化率会随自旋轨道耦合改变表现出不同的变化规律.
採用密度矩陣重整化群 ( density-matrix-renormalization-group, DMRG) 方法, 研究梯狀光晶格中排斥相互作用費米氣體的基態屬性. 研究錶明, Zeeman場能夠激髮繫統的相分離 (完全極化相和部分極化相), 而自鏇軌道耦閤效應能抑製相分離, 使整箇晶格處于部分極化相, 在不同的彊弱排斥相互作用繫統中, 極化率會隨自鏇軌道耦閤改變錶現齣不同的變化規律.
채용밀도구진중정화군 ( density-matrix-renormalization-group, DMRG) 방법, 연구제상광정격중배척상호작용비미기체적기태속성. 연구표명, Zeeman장능구격발계통적상분리 (완전겁화상화부분겁화상), 이자선궤도우합효응능억제상분리, 사정개정격처우부분겁화상, 재불동적강약배척상호작용계통중, 겁화솔회수자선궤도우합개변표현출불동적변화규률.
The density-matrix-renormalization-group ( DMRG ) method is used to numerically calculate the ground state of repulsively interacting Fermi atoms loaded in optical ladder lattices. It is found that the system exhibits the spatial separation of a fully spin-polarized phase from the partially polarized phase for the suitable intensity of Zeeman field without the effect of spin-orbit coupled atoms. The spin-orbit coupling drives the fully spin-polarized phase to the partially spin-polarized phase in the whole system. The spin polarizations of weak and strong repulsively interac-ting systems vary differently with spin-orbit interaction strength.
