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arXiv 2102.09987cond-mat.stat-mechcond-mat.quant-gasmath-phmath.MP
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Lieb-Liniger模型中非平衡动力学的系统强耦合展开

Systematic strong coupling expansion for out-of-equilibrium dynamics in the Lieb-Liniger model

Etienne Granet, Fabian H. L. Essler

摘要:

我们考虑了排斥Lieb-Liniger模型中相互作用猝灭后局部观测量的时间演化。系统初始化在基态消失的相互作用,然后时间演化与大,有限的相互作用强度$c$的Lieb-Liniger哈密顿量。我们采用淬灭作用的方法来表达的本地观测的能量本征态的总和方面的完整的时间演化,然后推导出领先的条款的$1/c$展开的几个一点和两点函数作为时间的函数$t > 0$量子淬灭后。我们观察到微妙的取消的贡献,取决于细节的选择的代表性的状态在淬灭行动的方法和我们的最终结果是独立的选择的光谱总和。我们的研究结果提供了一个高度非平凡的确认淬火行动的方法的典型性假设。

英文摘要:

We consider the time evolution of local observables after an interaction quench in the repulsive Lieb-Liniger model. The system is initialized in the ground state for vanishing interaction and then time-evolved with the Lieb-Liniger Hamiltonian for large, finite interacting strength $c$. We employ the Quench Action approach to express the full time evolution of local observables in terms of sums over energy eigenstates and then derive the leading terms of a $1/c$ expansion for several one and two-point functions as a function of time $t > 0$ after the quantum quench. We observe delicate cancellations of contributions to the spectral sums that depend on the details of the choice of representative state in the Quench Action approach and our final results are independent of this choice. Our results provide a highly non-trivial confirmation of the typicality assumptions underlying the Quench Action approach.

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