Emergence of topological and strongly correlated ground states in trapped Rashba spin-orbit-coupled Bose gases

作者：Ramachandhran B^*; Hu Hui; Pu Han

来源：Physical Review A, 2013, 87(3): 033627.

DOI：10.1103/PhysRevA.87.033627

We theoretically study an interacting few-body system of Rashba spin-orbit-coupled two-component Bose gases confined in a harmonic trapping potential. We solve the interacting Hamiltonian at large Rashba coupling strengths using an exact-diagonalization scheme, and obtain the ground-state phase diagram for a range of interatomic interactions and particle numbers. At small particle numbers, we observe that the bosons condense to an array of topological states with n + 1/2 quantum angular momentum vortex configurations, where n = 0,1,2,3, . . .. At large particle numbers, we observe two distinct regimes: at weaker-interaction strengths, we obtain ground states with topological and symmetry properties that are consistent with mean-field theory computations; at stronger-interaction strengths, we report the emergence of strongly correlated ground states. DOI: 10.1103/PhysRevA.87.033627

• 出版日期2013-3-26