Crossover from weak localization to weak antilocalization in a disordered microbridge

TL;DR

This paper investigates how weak localization corrections in disordered microbridges transition between different symmetry regimes, revealing the influence of non-homogeneities on magnetoconductance.

Contribution

It provides a scattering-matrix based analysis of the crossover from weak localization to weak antilocalization in disordered microbridges, highlighting the impact of non-uniformities.

Findings

Universal limiting values in symmetry classes

Functional form affected by non-homogeneities

Magnetoconductance crossover behavior characterized

Abstract

We calculate the weak localization correction in the double crossover to broken time-reversal and spin-rotational symmetry for a disordered microbridge or a short disordered wire using a scattering-matrix approach. Whereas the correction has universal limiting values in the three basic symmetry classes, the functional form of the magnetoconductance is affected by eventual non-homogeneities in the microbridge.