Conductance Fluctuations and Spin Symmetries in Quantum Dots

TL;DR

This paper investigates conductance fluctuations in GaAs quantum dots with spin-orbit and Zeeman effects, comparing experimental results to random matrix theory to understand spin symmetry regimes and the impact of magnetic fields.

Contribution

It provides a comprehensive experimental and theoretical analysis of conductance fluctuations considering orbital magnetic effects and spin symmetries in quantum dots.

Findings

Excellent agreement between experiment and theory when accounting for orbital magnetic coupling.

Identification of different spin symmetry regimes depending on experimental parameters.

Orbital coupling of magnetic fields can break time-reversal symmetry in quantum dots.

Abstract

Conductance fluctuations in GaAs quantum dots with spin-orbit and Zeeman coupling are investigated experimentally and compared to a random matrix theory formulation that defines a number of regimes of spin symmetry depending on experimental parameters. Accounting for orbital coupling of the in-plane magnetic field, which can break time-reversal symmetry, yields excellent overall agreement between experiment and theory.