Time-dependent resonant tunneling for a parallel-coupled double quantum dots

TL;DR

This paper develops quantum rate equations for a double quantum dot Aharonov-Bohm interferometer to analyze time-dependent resonant tunneling, revealing controllable Fano and Lorentzian resonance behaviors in photocurrent due to interference effects.

Contribution

It introduces a theoretical framework using nonequilibrium Green's functions to study photon-assisted tunneling in a parallel-coupled double quantum dot system.

Findings

Resonant photon-assisted tunneling peaks exhibit Fano and Lorentzian characteristics.

Interference effects between pathways are controllable via magnetic flux.

The model provides insights into quantum interference in time-dependent tunneling.

Abstract

We derive the quantum rate equations for an Aharonov-Bohm interferometer with two vertically coupled quantum dots embedded in each of two arms by means of the nonequilibrium Green's function in the sequential tunneling regime. Basing on these equations, we investigate time-dependent resonant tunneling under a small amplitude irradiation and find that the resonant photon-assisted tunneling peaks in photocurrent demonstrate a combination behavior of Fano and Lorentzian resonances due to the interference effect between the two pathways in this parallel configuration, which is controllable by threading the magnetic flux inside this device.