Shot noise in a quantum dot coupled to non-magnetic leads: Effects of Coulomb interaction

TL;DR

This paper investigates how Coulomb interactions and magnetic fields influence shot noise in a quantum dot with non-magnetic leads, revealing conditions for super- and sub-Poissonian noise and how ESR fields can control noise behavior.

Contribution

It demonstrates the impact of Coulomb interaction and magnetic fields on shot noise, highlighting the transition from super- to sub-Poissonian noise via ESR driving, which was not previously explored.

Findings

Super-Poissonian noise occurs when Coulomb blockade is partially lifted.

Super-Poissonian noise can be suppressed by applying ESR fields.

Strong ESR fields can switch noise from super- to sub-Poissonian.

Abstract

We study electron transport through a quantum dot, connected to non-magnetic leads, in a magnetic field. A super-Poissonian electron noise due to the effects of both interacting localized states and dynamic channel blockade is found when the Coulomb blockade is partially lifted. This is sharp contrast to the sub-Poissonian shot noise found in the previous studies for a large bias voltage, where the Coulomb blockade is completely lifted. Moreover, we show that the super-Poissonian shot noise can be suppressed by applying an electron spin resonance (ESR) driving field. For a sufficiently strong ESR driving field strength, the super-Poissonian shot noise will change to be sub-Poissonian.