Noise spectra of an interacting quantum dot

TL;DR

This paper analyzes the noise spectra of an interacting quantum dot with multiple energy levels, revealing features like steps and dips related to the dot's internal structure, and explores effects of bias and temperature.

Contribution

It provides a theoretical analysis of noise spectra in a multi-level quantum dot with interactions within the Hartree-Fock approximation, including effects of bias and temperature.

Findings

Noise spectra show steps and dips at frequencies linked to energy levels.

Interactions and external parameters significantly influence the noise features.

Finite bias and temperature modify the noise spectra in predictable ways.

Abstract

We study the noise spectra of a many-level quantum dot coupled to two electron reservoirs, when interactions are taken into account only on the dot within the Hartree-Fock approximation. The dependence of the noise spectra on the interaction strength, the coupling to the leads, and the chemical potential is derived. For zero bias and zero temperature, we find that as a function of the (external) frequency, the noise exhibits steps and dips at frequencies reflecting the internal structure of the energy levels on the dot. Modifications due to a finite bias and finite temperatures are investigated for a non-interacting two-level dot. Possible relations to experiments are pointed out.