Critical behavior of Anderson transitions in higher dimensional Bogoliubov-de Gennes symmetry classes

TL;DR

This paper investigates the critical behavior of Anderson transitions in higher-dimensional Bogoliubov-de Gennes symmetry classes, combining resummation techniques and numerical simulations to estimate critical exponents and explore upper critical dimensions.

Contribution

It applies Borel-Padé resummation to perturbative results and provides numerical simulations for higher-dimensional classes, advancing understanding of Anderson transitions beyond the lower critical dimension.

Findings

Estimated critical exponents using resummation methods.

Numerical results for classes DIII in 3D, C and CI in 4D.

Insights into the upper critical dimension for Anderson transitions.

Abstract

Disorder is ubiquitous in solid-state systems, and its crucial influence on transport properties was revealed by the discovery of Anderson localization. Generally speaking, all bulk states will be exponentially localized in the strong disorder limit, but whether an Anderson transition takes place depends on the dimension and symmetries of the system. The scaling theory and symmetry classes are at the heart of the study of the Anderson transition, and the critical exponent $\nu$ characterizing the power-law divergence of localization length is of particular interest. In contrast with the well-established lower critical dimension $d_l=2$ of the Anderson transition, the upper critical dimension $d_u$, above which the disordered system can be described by mean-field theory, remains uncertain, and precise numerical evaluations of the critical exponent in higher dimensions are needed. In this study, we apply Borel-Pad\'e resummation method to the known perturbative results of the non-linear sigma model (NL$\sigma$M) to estimate the critical exponents of the Boguliubov-de Gennes (BdG) classes. We also report numerical simulations of class DIII in 3D, and classes C and CI in 4D, and compare the results of the resummation method with these and previously published work. Our results may be experimentally tested in realizations of quantum kicked rotor models in atomic-optic systems, where the critical behavior of dynamical localization in higher dimensions can be measured.