Asymmetry of Nonlinear Transport and Electron Interactions in Quantum Dots

TL;DR

This paper experimentally investigates the nonlinear transport properties of chaotic quantum dots, revealing antisymmetric conductance components that fluctuate mesoscopically and enable measurement of electron interaction strength.

Contribution

It demonstrates the existence of antisymmetric differential conductance components in nonlinear transport, providing a new method to measure electron interactions in quantum dots.

Findings

Antisymmetric conductance component fluctuates mesoscopically.

Component absent in linear transport regime.

Allows measurement of electron interaction strength.

Abstract

The symmetry properties of transport beyond the linear regime in chaotic quantum dots are investigated experimentally. A component of differential conductance that is antisymmetric in both applied source-drain bias V and magnetic field B, absent in linear transport, is found to exhibit mesoscopic fluctuations around a zero average. Typical values of this component allow a measurement of the electron interaction strength.