紧束缚近似下自旋为1原子的玻色爱因斯坦凝聚(英文)

Bose-Einstein Condensation of Spin-1 Atoms in Tight-binding Bands

我们从理论上研究了囚禁在光晶格中自旋为1的理想的原子气体的玻色爱因斯坦凝聚.在粒子数和磁化强度守恒的条件下,首先,我们研究了自旋为1的无相互作用原子系统和凝聚分数.我们发现含有自旋自由度的玻色爱因斯坦凝聚现象和标量原子系统相比,展现出更丰富的相变.然后我们将研究扩展到有一个外部磁场存在的情况,这样相变过程再次发生了一些值得讨论的变化.

We present a theoretical study of Bose-Einstein condensation（BEC） of trapped ideal gas of spin-1 ultracold atoms in tight-binding bands corresponding to simple cubic（SC） optical lattices. Under the constraints that both the total number of atoms （N） and the total magnetization （M） are conserved, we first investigate the phase transitions process of noninteracting spin-1 atomic system, by investigating the critical condensation temperature and condensate fraction, we find BEC with spin degrees of freedom shows richer phase transitions than BEC of scalar atoms. We then extend our studies to the case with a uniform external magnetic field included, the phase transitions for this case make interesting changes again.