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arXiv 2007.01748cond-mat.dis-nncond-mat.mes-hallquant-ph
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Rosenzweig-Porter模型在非遍历扩展区域的超泊松行为

On super-Poissonian behavior of the Rosenzweig-Porter model in the non-ergodic extended regime

Richard Berkovits

摘要:

Rosenzweig-Porter模型由于其在遍历扩展金属相和局域相之间表现出非遍历扩展相而引起了人们的兴趣。这样一个阶段与许多物理模型相关,从高能物理和量子引力中的Sachdev-Ye-Kitaev模型,到凝聚态物理和量子计算中的相互作用多体局域化。这个阶段的特点是分形行为的波函数,和一个假设的相关的小型能带结构的能谱。在这里,我们将在光谱中寻找后者的证据。由于这种行为在中等能量尺度上是预期的,所以光谱刚性是一种自然的梳理方法。然而,由于能量的不确定性和解折叠过程中的模糊性,结果是不确定的。另一方面,通过使用奇异值分解方法,在这个政权的超泊松行为出现明确的证据,与相关的迷你带的图片一致。

英文摘要:

The Rosenzweig-Porter model has seen a resurgence in interest as it exhibits a non-ergodic extended phase between the ergodic extended metallic phase and the localized phase. Such a phase is relevant to many physical models from the Sachdev-Ye-Kitaev model in high-energy physics and quantum gravity, to the interacting many-body localization in condensed matter physics and quantum computing. This phase is characterized by fractal behavior of the wavefunctions, and a postulated correlated mini-band structure of the energy spectrum. Here we will seek evidence for the latter in the spectrum. Since this behavior is expected on intermediate energy scales spectral rigidity is a natural way to tease it out. Nevertheless, due to the Thouless energy and ambiguities in the unfolding procedure, the results are inconclusive. On the other hand, by using the singular value decomposition method, clear evidence for a super-Poissonian behavior in this regime emerges, consistent with a picture of correlated mini-bands.

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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