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arXiv 1201.3154cond-mat.quant-gas
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快速晶格斜升过程中凝聚分数的演化

Evolution of condensate fraction during rapid lattice ramps

Stefan S. Natu, David C. McKay, Brian DeMarco, Erich J. Mueller

摘要:

结合实验和数值模拟,我们研究了囚禁在光晶格中的原子气体在晶格深度迅速减小时准动量的重新分布。我们发现,相互作用导致毫秒时间尺度上的显着的动量重新分配,从而使先前的假设绝热。我们表明,这种现象是由低动量粒子-空穴激发在相互作用系统中的存在。我们的研究结果无效带映射作为相互作用气体的平衡探针。

英文摘要:

Combining experiments and numerical simulations, we investigate the redistribution of quasi-momentum in a gas of atoms trapped in an optical lattice when the lattice depth is rapidly reduced. We find that interactions lead to significant momentum redistribution on millisecond timescales, thereby invalidating previous assumptions regarding adiabaticity. We show that this phenomenon is driven by the presence of low-momentum particle-hole excitations in an interacting system. Our results invalidate bandmapping as an equilibrium probe in interacting gases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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