Changing the Electronic Spectrum of a Quantum Dot by Adding Electrons

TL;DR

This paper investigates how adding electrons to a quantum dot affects its electronic spectrum, revealing spectral scrambling and changes in peak correlations through temperature-dependent measurements.

Contribution

It demonstrates that adding electrons causes spectral scrambling in quantum dots, evidenced by deviations from random matrix theory and altered peak correlations.

Findings

Spectral scrambling occurs after adding few electrons.

Enhanced peak-to-peak correlations at low temperature.

Similar peak height behavior across different dot configurations.

Abstract

The temperature dependence of Coulomb blockade peak height correlation is used to investigate how adding electrons to a quantum dot alters or "scrambles" its electronic spectrum. Deviations from finite-temperature random matrix theory with an unchanging spectrum indicate spectral scrambling after a small number of electrons are added. Enhanced peak-to-peak correlations at low temperature are observed. Peak height statistics show similar behavior in several dot configurations despite significant differences in correlations.