Coexisting spin and Rabi-oscillations at intermediate time in electron transport through a photon cavity

TL;DR

This paper models time-dependent electron transport in a double quantum dot within a photon cavity, revealing coexistence of spin-dependent Rabi oscillations and non-equilibrium charge fluctuations in intermediate times.

Contribution

It introduces a theoretical framework combining Coulomb interactions, magnetic fields, and photon coupling to analyze transient quantum transport phenomena.

Findings

Rabi oscillations coexist with spin-dependent charge fluctuations

Charge oscillations are induced by interdot Rabi oscillations

Distinct steady-state correlations are identified in different transport regimes

Abstract

We model theoretically the time-dependent transport through an asymmetric double quantum dot etched in a two-dimensional wire embedded in a FIR photon cavity. For the transient and the intermediate time regimes the currents and the average photon number are calculated by solving a Markovian master equation in the dressed-states picture, with the Coulomb interaction also being taken into account. We predict that in the presence of a transverse magnetic field the interdot Rabi oscillations appearing in the intermediate and transient regime coexist with slower non-equilibrium fluctuations in the occupation of states for opposite spin orientation. The interdot Rabi oscillation induces charge oscillations across the system and a phase difference between the transient source and drain currents. We point out a difference between the steady-state correlation functions in the Coulomb blocking and the photon-assisted transport regimes.