Heavily damped motion of one-dimensional Bose gases in an optical lattice.
Heavily damped motion of one-dimensional Bose gases in an optical lattice.
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DOI：
10.1103/physrevlett.102.030407
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发表时间：
2008-05
影响因子：
8.6
通讯作者：
I. Danshita;C. Clark
中科院分区：
文献类型：
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作者：
I. Danshita;C. Clark
我们研究了强相关一维玻色气体在组合谐波和光学晶格势中受到限制势突然位移的动力学。使用时间演化分块抽取方法，我们对 Fertig 等人的实验进行了第一原理量子多体模拟。 [物理。莱特牧师。 94, 120403 (2005)]跨越从超流体到莫特绝缘体状态的不同晶格深度值。我们发现与该实验良好的定量一致性：即使对于浅晶格，偶极子振荡的阻尼也很重要，并且随着观察到的晶格深度的增加，运动变得过阻尼。我们表明，向过阻尼的转变归因于量子涨落加速的超流体流动的衰减，这发生在莫特绝缘体域出现之前。
We study the dynamics of strongly correlated one-dimensional Bose gases in a combined harmonic and optical lattice potential subjected to sudden displacement of the confining potential. Using the time-evolving block decimation method, we perform a first-principles quantum many-body simulation of the experiment of Fertig et al. [Phys. Rev. Lett. 94, 120403 (2005)] across different values of the lattice depth ranging from the superfluid to the Mott insulator regimes. We find good quantitative agreement with this experiment: the damping of the dipole oscillations is significant even for shallow lattices, and the motion becomes overdamped with increasing lattice depth as observed. We show that the transition to overdamping is attributed to the decay of superfluid flow accelerated by quantum fluctuations, which occurs well before the emergence of Mott insulator domains.