Conductance oscillations in tunnel-coupled quantum dots in the quantum Hall regime

TL;DR

This study investigates conductance oscillations in tunnel-coupled quantum dots under strong magnetic fields, revealing a pattern of shifts and modulations linked to quantum Hall effects and charge variations.

Contribution

It demonstrates the observation of conductance oscillations and pattern repetition in coupled quantum dots in the quantum Hall regime, highlighting frequency locking effects.

Findings

Conductance peaks shift and modulate with magnetic field.

Pattern repeats over large magnetic field ranges.

Pattern repetition linked to frequency locking.

Abstract

We present measurements of transport through two tunnel-coupled quantum dots of different sizes connected in series in a strong, variable, perpendicular magnetic field. Double dot conductance was measured both as a function of magnetic field, which was varied across the filling factor nu = 4 quantum Hall plateau, and as a function of charge induced evenly on the two dots. The conductance peaks undergo position shifts and height modulations as the magnetic field is varied. These shifts and modulations form a pattern that repeats over large ranges of magnetic field and with the addition of double dot charge. The robust pattern repetition is consistent with a frequency locking effect.