Hard-core bosons on optical superlattices: Dynamics and relaxation in the superfluid and insulating regimes
Hard-core bosons on optical superlattices: Dynamics and relaxation in the superfluid and insulating regimes
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DOI：
10.1103/physreva.74.053616
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发表时间：
2006-11
影响因子：
2.9
通讯作者：
M. Rigol;A. Muramatsu;M. Olshanii
中科院分区：
文献类型：
--
作者：
M. Rigol;A. Muramatsu;M. Olshanii
研究了一维晶格中硬核玻色子在附加周期势(超晶格)和简谐陷阱存在时的基态性质和非平衡动力学。分析了超晶格电势突然开启或关断后的动力学行为，超晶格电势突然开启或关闭会使系统分别进入绝缘相和超流体相。在第一种情况下，可以看到零动量峰值的崩溃和复苏。我们详细地研究了这些可积系统向平衡的松弛。我们展示了在松弛之后，如何通过推广吉布斯分布来预测物理可观测值的平均值，例如动量分布函数。
We study the ground-state properties and nonequilibrium dynamics of hard-core bosons confined in one-dimensional lattices in the presence of an additional periodic potential (superlattice) and a harmonic trap. The dynamics is analyzed after a sudden switch-on or switch-off of the superlattice potential, which can bring the system into insulating or superfluid phases, respectively. A collapse and revival of the zero-momentum peak can be seen in the first case. We study in detail the relaxation of these integrable systems towards equilibrium. We show how after relaxation time averages of physical observables, like the momentum distribution function, can be predicted by means of a generalization of the Gibbs distribution.