中文

精确量子多体疤痕态在微扰下的缓慢热化

量子气体 2020-07-15 v3 统计力学

摘要

量子多体疤痕态是原本热化系统中不满足本征态热化假说的例外有限能量密度本征态。我们研究了精确多体疤痕态在微扰下的命运。在小系统尺寸下,由微扰理论描述的变形疤痕态得以存活。然而,我们从非对角矩阵元的有限尺寸标度论证了它们在热力学极限下最终会热化。尽管如此,我们通过数值和解析方法证明,在淬火实验中疤痕的非热性质能在参数化长的时间内持续存在。我们给出了一个严格的论证,将任意疤痕态的热化时间下界定为 tO(λ1/(1+d))t^{*} \sim O(\lambda^{-1/(1+d)}),其中 dd 是系统的空间维度,λ\lambda 是微扰强度。

关键词

引用

@article{arxiv.1910.07669,
  title  = {Slow Thermalization of Exact Quantum Many-Body Scar States Under Perturbations},
  author = {Cheng-Ju Lin and Anushya Chandran and Olexei I. Motrunich},
  journal= {arXiv preprint arXiv:1910.07669},
  year   = {2020}
}

备注

v3: published version v2: added: (1) generalize the thermalization bound to general initial state, which includes the perfect oscillations in models with towers of scars under perturbations. (2) numerical study on perturbed spin-1 XY model