Chirality in Coulomb-blockaded quantum dots

TL;DR

This paper studies how reversing magnetic fields affects the conductance in Coulomb-blockaded quantum dots with chiral edge states, revealing asymmetries due to single-charge effects that disappear at high temperatures.

Contribution

It demonstrates that magnetic-field asymmetry in quantum dot conductance originates from single-charge effects and depends on temperature, highlighting the role of chirality.

Findings

Magnetic-field reversal causes conductance asymmetry.

Asymmetry vanishes at high temperatures.

Chirality influences charge polarization and transport.

Abstract

We investigate the two-terminal nonlinear conductance of a Coulomb-blockaded quantum dot attached to chiral edge states. Reversal of the applied magnetic field inverts the system chirality and leads to a different polarization charge. As a result, the current--voltage characteristic is not an even function of the magnetic field. We show that the corresponding magnetic-field asymmetry arises from single-charge effects and vanishes in the limit of high temperature.