Transport of strong-coupling polarons in optical lattices

Transport of strong-coupling polarons in optical lattices
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光学晶格中强耦合极化子的传输

DOI:
10.1088/1367-2630/10/3/033015
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发表时间:
2008
影响因子:
3.3
通讯作者:
Bruderer M
Bruderer M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bruderer M

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研究了超冷杂质原子在玻色-爱因斯坦凝聚体(BEC)中的输运问题。在强耦合制度,我们推导出一个扩展的哈伯德模型描述的动力学的杂质的极化子,即杂质打扮的相干态的Bogoliubov声子。使用广义主方程的基础上,这个微观模型,我们表明,非弹性和耗散声子散射的结果(i)的交叉从相干到非相干的杂质输运BEC温度的增加和(ii)出现的净原子电流在倾斜的光学晶格。原子电流对晶格倾斜的依赖性在实验可达到的参数范围内从欧姆电导变为负微分电导。这种转变是准确地描述了江崎津型的杂质作为一个依赖于温度的参数的有效弛豫时间的关系。
We study the transport of ultracold impurity atoms immersed in a Bose–Einstein condensate (BEC) and trapped in a tight optical lattice. Within the strong-coupling regime, we derive an extended Hubbard model describing the dynamics of the impurities in terms of polarons, ie impurities dressed by a coherent state of Bogoliubov phonons. Using a generalized master equation based on this microscopic model, we show that inelastic and dissipative phonon scattering results in (i) a crossover from coherent to incoherent transport of impurities with increasing BEC temperature and (ii) the emergence of a net atomic current across a tilted optical lattice. The dependence of the atomic current on the lattice tilt changes from ohmic conductance to negative differential conductance within an experimentally accessible parameter regime. This transition is accurately described by an Esaki–Tsu-type relation with the effective relaxation time of the impurities as a temperature-dependent parameter.
玻色子波场的经典理论
DOI: 10.1016/0003-4916(58)90037-x
发表时间: 1958
期刊: Annals of Physics
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E. Gross
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A. Klein;M. Fleischhauer
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量子力学中的多体问题
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