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arXiv 2010.13832cond-mat.quant-gas
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从多体振荡到孤立旋量气体的热化

From many-body oscillations to thermalization in an isolated spinor gas

Bertrand Evrard, An Qu, Jean Dalibard, Fabrice Gerbier

摘要:

多体系统的动力学可以有多种形式,从纯粹的可逆演化到快速热化。在这里,我们通过实验和数值计算表明,自旋为1的原子在同一空间模式下的组装允许人们探索这种广泛的行为。当系统可以用Bogoliubov分析描述时,相关的能谱是线性的,并导致多体观测量的无阻尼振荡。在此范围之外,光谱的非线性导致不可逆性,其特征在于普遍的行为。当哈密顿量的可积性被破坏时,混沌动力学出现并导致热化,与本征态热化假设范式一致。

英文摘要:

The dynamics of a many-body system can take many forms, from a purely reversible evolution to fast thermalization. Here we show experimentally and numerically that an assembly of spin 1 atoms all in the same spatial mode allows one to explore this wide variety of behaviors. When the system can be described by a Bogoliubov analysis, the relevant energy spectrum is linear and leads to undamped oscillations of many-body observables. Outside this regime, the non-linearity of the spectrum leads to irreversibity, characterized by a universal behavior. When the integrability of the Hamiltonian is broken, a chaotic dynamics emerges and leads to thermalization, in agreement with the Eigenstate Thermalization Hypothesis paradigm.

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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