Coulomb Blockade Fluctuations in Strongly Coupled Quantum Dots

TL;DR

This paper studies how quantum fluctuations of Coulomb blockade in semiconductor quantum dots depend on coupling strength, revealing enhanced peak motion at low temperatures without increased correlation, and suggesting possible Kondo-like behavior.

Contribution

It provides new insights into Coulomb blockade fluctuations under strong coupling and low temperature, highlighting phenomena similar to Kondo physics.

Findings

Peak motion amplitude increases at low temperature in strongly coupled dots.

Peak-to-peak correlation does not increase with stronger coupling.

Anomalous temperature dependence in Coulomb valleys observed, akin to Kondo effects.

Abstract

Quantum fluctuations of Coulomb blockade are investigated as a function of the coupling to reservoirs in semiconductor quantum dots. We use fluctuations in the distance between peaks $\Delta N$ apart to characterize both the amplitude and correlation of peak motion. For strong coupling, peak motion is greatly enhanced at low temperature, but does not show an increase in peak-to-peak correlation. These effects can lead to anomalous temperature dependence in the Coulomb valleys, similar to behavior ascribed to Kondo physics.