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arXiv 1601.01397cond-mat.quant-gas
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共振玻色气体中的后猝灭动力学和预热化

Post-quench dynamics and pre-thermalization in a resonant Bose gas

Xiao Yin, Leo Radzihovsky

摘要:

我们探讨了一个共振玻色气体的动力学后,其淬火到一个强相互作用的制度附近的费什巴赫共振。对于这样的深度淬火,我们利用自洽的动态场近似,并发现在初始制度的多体拉比之间的凝聚体和有限动量准粒子对的振荡,在很长的时间,气体达到一个预热化非平衡稳态。我们探索由此产生的状态,通过其广泛的固定动量分布函数,表现出幂律高动量的尾巴。我们研究了相关的增强耗尽的动力学和稳态形式,猝灭率相关的激发能,谭氏接触,结构函数和射频光谱。我们发现这些预测与最近的实验定性一致。

英文摘要:

We explore the dynamics of a resonant Bose gas following its quench to a strongly interacting regime near a Feshbach resonance. For such deep quenches, we utilize a self-consistent dynamic field approximation and find that after an initial regime of many-body Rabi-like oscillations between the condensate and finite-momentum quasiparticle pairs, at long times, the gas reaches a pre-thermalized nonequilibrium steady state. We explore the resulting state through its broad stationary momentum distribution function, that exhibits a power-law high momentum tail. We study the dynamics and steady-state form of the associated enhanced depletion, quench-rate dependent excitation energy, Tan's contact, structure function and radio frequency spectroscopy. We find these predictions to be in a qualitative agreement with recent experiments.

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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