Crossover of thermal to shot noise in chaotic cavities

TL;DR

This paper investigates how thermal effects influence shot noise in chaotic quantum dots with non-ideal contacts, revealing a critical point and thermal behavior anomalies in noise suppression and amplification.

Contribution

It provides a detailed analysis of the thermal to shot noise crossover in chaotic cavities, including effects of finite temperature and non-ideal contacts, and identifies a critical tunneling barrier value.

Findings

Temperature affects noise suppression and amplification.

Weak localization contribution shows anomalous thermal behavior.

Identifies a critical tunneling barrier value.

Abstract

We study the crossover between thermal and shot-noise power in a chaotic quantum dot in the presence of non-ideal contacts at finite temperature. The result explicitly demonstrates that the temperature affect the suppression-amplification effect present in the main quantum noise. In particular, the weak localization contribution to the noise has an anomalous thermal behavior when one let the barriers vary, indicating the presence of a critical point related to specific value of the tunneling barriers. We also show how to get to the opaque limit of the quantum dot at finite temperature.