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Effects of critical correlations on quantum percolation in two dimensions

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

De Tomasi, G 
Hart, O 
Castelnovo, C 

Abstract

We analyze the out-of-equilibrium dynamics of a quantum particle coupled to local magnetic degrees of freedom that undergo a classical phase transition. Specifically, we consider a two-dimensional tight-binding model that interacts with a background of classical spins in thermal equilibrium, which are subject to Ising interactions and act as emergent, correlated disorder for the quantum particle. Particular attention is devoted to temperatures close to the ferromagnet-to-paramagnet transition. To capture the salient features of the classical transition, namely the effects of long-range correlations, we focus on the strong coupling limit, in which the model can be mapped onto a quantum percolation problem on spin clusters generated by the Ising model. By inspecting several dynamical probes such as energy level statistics, inverse participation ratios, and wave-packet dynamics, we provide evidence that the classical phase transition might induce a delocalization-localization transition in the quantum system at certain energies. We also identify further important features due to the presence of Ising correlations, such as the suppression of compact localized eigenstates.

Description

Keywords

cond-mat.dis-nn, cond-mat.dis-nn, cond-mat.stat-mech, quant-ph

Journal Title

Physical Review B

Conference Name

Journal ISSN

2469-9950
2469-9969

Volume Title

105

Publisher

American Physical Society (APS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/P034616/1)
EPSRC (EP/T028580/1)
EPSRC (EP/V062654/1)
Engineering and Physical Sciences Research Council (EP/M007065/1)