Microwave spectroscopy of few-carrier states in bilayer graphene quantum dots

TL;DR

This study employs circuit QED techniques to perform high-resolution spectroscopy of few-carrier states in bilayer graphene quantum dots, revealing spin and valley blockade phenomena and advancing understanding of these quantum systems.

Contribution

It introduces a cQED-based method for detailed spectroscopy of few-carrier states in bilayer graphene quantum dots, surpassing traditional transport techniques.

Findings

Detection of Pauli spin and valley blockade

Characterization of the spin-orbit gap at zero magnetic field

Demonstration of cQED as a powerful probe for semiconductor nanostructures

Abstract

Bilayer graphene is a maturing material platform for gate-defined quantum dots that hosts long-lived spin and valley states. Implementing solid-state qubits in bilayer graphene requires a fundamental understanding of such confined electronic systems. In particular, states of two and three carriers, for which the exchange interaction between particles plays a crucial role, are a cornerstone for qubit readout and manipulation. Here we report on the spectroscopy of few-carrier states in bilayer graphene quantum dots, using circuit quantum electrodynamics (cQED) techniques that offer substantially improved energy resolution compared to standard transport techniques. Measurements using a superconducting high-impedance resonator capacitively coupled to the double quantum dot reveal dispersive features of two and three electron states, enabling the detection of Pauli spin and valley blockade and the characterization of the spin-orbit gap at zero magnetic field. The results deepen our understanding of few-carrier spin and valley states in bilayer graphene quantum dots and demonstrate that cQED techniques are a powerful state-selective probe for semiconductor nanostructures.