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arXiv 0909.4168cond-mat.quant-gas
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费米子对凝聚体对相互作用强度调制的延迟响应

Delayed response of a fermion-pair condensate to a modulation of the interaction strength

J. Plata

摘要:

用解析方法研究了相互作用强度的正弦调制对费米子对凝聚的影响。该系统是由耦合的费米子玻色子模型,其中包括一个随时间变化的磁费什巴赫共振诱导的模间耦合的概括。非平凡的影响出现依赖于调制周期的相对大小和弛豫时间的冷凝物。具体地说,非绝热调制驱动系统的热平衡:外场诱导的准粒子能量的变化,并反过来,相关的人口的不平衡。随后的弛豫过程进行了研究,并获得了间隙动力学的解析描述。最近的实验结果进行解释:在响应所施加的字段中观察到的延迟被理解为与冷凝物弛豫时间的温度效应。

英文摘要:

The effect of a sinusoidal modulation of the interaction strength on a fermion-pair condensate is analytically studied. The system is described by a generalization of the coupled fermion-boson model that incorporates a time-dependent intermode coupling induced via a magnetic Feshbach resonance. Nontrivial effects are shown to emerge depending on the relative magnitude of the modulation period and the relaxation time of the condensate. Specifically, a nonadiabatic modulation drives the system out of thermal equilibrium: the external field induces a variation of the quasiparticle energies, and, in turn, a disequilibrium of the associated populations. The subsequent relaxation process is studied and an analytical description of the gap dynamics is obtained. Recent experimental findings are explained: the delay observed in the response to the applied field is understood as a temperature effect linked to the condensate relaxation time.

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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