Shot Noise in Ballistic Quantum Dots with a Mixed Classical Phase Space

TL;DR

This paper studies how shot noise in quantum dots with mixed regular and chaotic classical phase space is suppressed below universal levels, revealing the influence of phase-space structures and scattering on quantum transport.

Contribution

It introduces a novel approach to incorporate diffractive impurity scattering and links shot noise suppression to phase-space dynamics in quantum dots.

Findings

Shot noise is systematically suppressed below the universal value.

Suppression depends on lead positions and scattering rate.

Deterministic transport in regular regions causes noise reduction.

Abstract

We investigate shot noise for quantum dots whose classical phase space consists of both regular and chaotic regions. The noise is systematically suppressed below the universal value of fully chaotic systems, by an amount which varies with the positions of the leads. We analyze the dynamical origin of this effect by a novel way to incorporate diffractive impurity scattering. The dependence of the shot noise on the scattering rate shows that the suppression arises due to the deterministic nature of transport through regular regions and along short chaotic trajectories. Shot noise can be used to probe phase-space structures of quantum dots with generic classical dynamics.