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arXiv 1707.01073cond-mat.stat-mech
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内相斥哈伯德模型中的量子猝灭:Stationary State

Quantum Quench in the Infinitely Repulsive Hubbard Model: the Stationary State

Bruno Bertini, Elena Tartaglia, Pasquale Calabrese

摘要:

我们利用量子猝灭作用量方法研究了无限相互作用极限下哈伯德模型中量子猝灭后的非平衡动力学。我们确定了各种低纠缠的初始状态,我们可以直接计算与哈密顿的本征态的重叠。对于这些初始状态,我们解析地找到定态的快度分布表征所有局部观测值的期望值。一些考虑的初始状态是不反射对称的,导致非对称的快度分布。为了研究这种情况,我们必须引入一种广义形式的约化熵,它测量限制在非零重叠状态的熵。所考虑的初始状态是直接的实验现实性,也代表了理想的候选人研究非平衡动力学的有限相互作用的哈伯德模型。

英文摘要:

We use the Quench Action approach to study the non-equilibrium dynamics after a quantum quench in the Hubbard model in the limit of infinite interaction. We identify a variety of low-entangled initial states for which we can directly compute the overlaps with the Hamiltonian's eigenstates. For these initial states, we analytically find the rapidity distributions of the stationary state characterising the expectation values of all local observables. Some of the initial states considered are not reflection symmetric and lead to non-symmetric rapidity distributions. To study such cases, we have to introduce a generalised form for the reduced entropy which measures the entropy restricted to states with non-zero overlap. The initial states considered are of direct experimental realisability and also represent ideal candidates for studying non-equilibrium dynamics in the Hubbard model for finite interactions.

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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