Super-Poissonian shot noise in the resonant tunneling due to coupling with a localized level

TL;DR

This paper investigates how coupling a localized level to an interacting quantum dot affects shot noise, revealing super-Poissonian noise and a Rabi frequency peak controllable by dot-lead couplings.

Contribution

It demonstrates the emergence of super-Poissonian shot noise and a Rabi frequency peak in the spectrum due to coherent coupling with a localized level.

Findings

Zero-frequency shot noise can reach super-Poissonian levels.

The shot noise spectrum exhibits a peak at the Rabi frequency.

The Rabi frequency is tunable via dot-lead couplings.

Abstract

We report our studies of the shot noise spectrum in tunneling through an interacting quantum dot when an additional single-level quantum dot without tunnel coupling to leads is coherently side-connected to it. We show that the zero-frequency shot noise could reach a super-Poissonian value for appropriate ratios between dot-dot hoppings and dot-lead couplings, but the current is independent on the hopping. Moreover, the frequency spectrum of shot noise shows an obvious peak at the Rabi frequency, which is controllable by tuning the dot-lead couplings.