Kleinert H, Schmidt S, Pelster A
Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
Phys Rev Lett. 2004 Oct 15;93(16):160402. doi: 10.1103/PhysRevLett.93.160402. Epub 2004 Oct 12.
We calculate the location of the quantum phase transitions of a Bose gas trapped in an optical lattice as a function of effective scattering length a(eff) and temperature T. Knowledge of recent high-loop results on the shift of the critical temperature at weak couplings is used to locate a nose in the phase diagram above the free Bose-Einstein critical temperature T((0))(c), thus predicting the existence of a reentrant transition above T((0))(c), where a condensate should form when increasing a(eff). At zero temperature, the transition to the normal phase produces the experimentally observed Mott insulator.
我们计算了被困在光学晶格中的玻色气体的量子相变位置，它是有效散射长度a(eff)和温度T的函数。利用最近关于弱耦合下临界温度偏移的高圈结果知识，在自由玻色 - 爱因斯坦临界温度T((0))(c)之上的相图中确定一个“鼻点”，从而预测在T((0))(c)之上存在重入相变，即当增加a(eff)时应形成凝聚态。在零温度下，向正常相的转变产生了实验观测到的莫特绝缘体。
