Coexistence of Coulomb blockade and zero bias anomaly in a strongly coupled quantum dot

TL;DR

This paper investigates the simultaneous presence of Coulomb blockade and zero bias anomaly in a strongly coupled quantum dot, revealing their coexistence through experimental I-V measurements.

Contribution

It demonstrates the coexistence of Coulomb blockade and zero bias anomaly in a strongly coupled quantum dot, a phenomenon not previously characterized in such systems.

Findings

I-V curves show suppression of tunneling at Fermi level

Oscillating features shift with gate voltage

Both phenomena coexist in the same quantum dot system

Abstract

The current-voltage characteristics through a metallic quantum dot which is well coupled to a metallic lead are measured. It is shown that the I-V curves are composed of two contributions. One is a suppression of the tunneling conductivity at the Fermi level and the second is an oscillating feature which shifts with gate voltage. The results indicate that Zero-Bias-Anomaly and Coulomb Blockade phenomena coexist in an asymmetric strongly coupled quantum dot.