Polaron Physics in Optical Lattices
Polaron Physics in Optical Lattices
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DOI：
10.1103/physreva.76.011605
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发表时间：
2007-04
影响因子：
2.9
通讯作者：
M. Bruderer;A. Klein;S. Clark;D. Jaksch
中科院分区：
文献类型：
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作者：
M. Bruderer;A. Klein;S. Clark;D. Jaksch
研究了近均匀玻色-爱因斯坦凝聚体(BEC)对浸没陷阱杂质原子性质的影响。利用BEC-杂质相互作用强度的弱耦合展开，我们导出了一个描述极化子的模型，即被Bogoliubov声子相干态覆盖的杂质，并将其应用于光学晶格中的超冷玻色子原子。结果表明，随着BEC温度的升高，杂质的输运性质由凝聚转变为扩散。此外，稳定的极化子团簇是通过声子介导的离位吸引形成的。
We investigate the effects of a nearly uniform Bose-Einstein condensate (BEC) on the properties of immersed trapped impurity atoms. Using a weak-coupling expansion in the BEC-impurity interaction strength, we derive a model describing polarons, i.e., impurities dressed by a coherent state of Bogoliubov phonons, and apply it to ultracold bosonic atoms in an optical lattice. We show that, with increasing BEC temperature, the transport properties of the impurities change from coherent to diffusive. Furthermore, stable polaron clusters are formed via a phonon-mediated off-site attraction.