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arXiv 2004.03917cond-mat.stat-mech
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孤立量子系统涨落耗散定理的数值验证

Numerical Verification of Fluctuation Dissipation Theorem for Isolated Quantum Systems

Jae Dong Noh, Takahiro Sagawa, Joonhyun Yeo

摘要:

涨落耗散定理~(FDT)是吉布斯态热平衡系统的标志。我们解决的问题是否FDT服从孤立的量子系统的能量本征态。在本征态热化假设的框架下,我们导出了能量本征态和对角系综中两次关联函数的形式表达式。它们满足Kubo-Martin-Schwinger条件,这是FDT的充分必要条件,在无限大系统的大小限制。我们还得到了有限尺寸系统FDT的有限尺寸修正。通过对XXZ自旋链模型的大量数值计算,我们证实了我们的FDT理论和有限尺寸修正。我们的结果可以作为一个有限尺寸系统的FDT的实验研究的指导方针。

英文摘要:

The fluctuation dissipation theorem~(FDT) is a hallmark of thermal equilibrium systems in the Gibbs state. We address the question whether the FDT is obeyed by isolated quantum systems in an energy eigenstate. In the framework of the eigenstate thermalization hypothesis, we derive the formal expression for two-time correlation functions in the energy eigenstates or in the diagonal ensemble. They satisfy the Kubo-Martin-Schwinger condition, which is the sufficient and necessary condition for the FDT, in the infinite system size limit. We also obtain the finite size correction to the FDT for finite-sized systems. With extensive numerical works for the XXZ spin chain model, we confirm our theory for the FDT and the finite size correction. Our results can serve as a guide line for an experimental study of the FDT on a finite-sized system.

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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