Sub-diffusive Thouless time scaling in the Anderson model on random regular graphs

• URL: http://arxiv.org/abs/2201.04673v2
• Date: Thu, 14 Sep 2023 05:43:31 GMT
• Title: Sub-diffusive Thouless time scaling in the Anderson model on random regular graphs
• Authors: Luis Colmenarez, David J. Luitz, Ivan M. Khaymovich, Giuseppe De Tomasi
• Abstract summary: We study the scaling of the Thouless time in the Anderson model on random regular graphs with on-site disorder. We find that the scaling of the Thouless time is consistent with the existence of a sub-diffusive regime anticipating the localized phase.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The scaling of the Thouless time with system size is of fundamental importance to characterize dynamical properties in quantum systems. In this work, we study the scaling of the Thouless time in the Anderson model on random regular graphs with on-site disorder. We determine the Thouless time from two main quantities: the spectral form factor and the power spectrum. Both quantities probe the long-range spectral correlations in the system and allow us to determine the Thouless time as the time scale after which the system is well described by random matrix theory. We find that the scaling of the Thouless time is consistent with the existence of a sub-diffusive regime anticipating the localized phase. Furthermore, to reduce finite-size effects, we break energy conservation by introducing a Floquet version of the model and show that it hosts a similar sub-diffusive regime.

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