Synchronized coherent charge oscillations in coupled double quantum dots

TL;DR

This paper investigates synchronized charge oscillations in coupled double quantum dots, revealing interaction-dependent modes and proposing methods to detect phase locking using statistical tools.

Contribution

It introduces the concept of six oscillation modes in coupled quantum dots and demonstrates how bias tuning can isolate synchronized antiphase oscillations.

Findings

Six oscillation modes identified in coupled quantum dots

Bias voltage can select for synchronized antiphase oscillations

Waiting-time distributions and $g^{(2)}$-functions can detect phase locking

Abstract

We study coherent oscillations in double quantum dots tunnel-coupled to metallic leads by means of full counting statistics of electron transport. If two such systems are coupled by Coulomb interaction, there are in total six (instead of only two) oscillation modes of the entangled system with interaction-dependent oscillation frequencies. By tuning the bias voltage, one can engineer decoherence such that only one of the six modes, in which the charge oscillations in both double quantum dots become synchronized in antiphase, is singled out. We suggest to use waiting-time distributions and the $g^{(2)}$-correlation function to detect the common frequency and the phase locking.