Gates controlled parallel-coupled double quantum dot on both single layer and bilayer graphene

TL;DR

This paper demonstrates the fabrication and control of parallel-coupled double quantum dots in graphene, showing tunable interdot coupling and detailed characterization through transport measurements.

Contribution

It introduces a method to fabricate and tune double quantum dots in both single and bilayer graphene, with detailed analysis of their energy scales and coupling regimes.

Findings

Interdot coupling can be tuned from weak to strong

Honeycomb charge stability diagrams reveal key parameters

Quantum transport measurements characterize the quantum dots

Abstract

Here we report the fabrication and quantum transport measurements of gates controlled parallel-coupled double quantum dot on both bilayer and single layer graphene. It is shown that the interdot coupling strength of the parallel double dots can be effectively tuned from weak to strong regime by both the in-plane plunger gates and back gate. All the relevant energy scales and parameters of the graphene parallel-coupled double dot can be extracted from the honeycomb charge stability diagrams revealed through the transport measurements.