Graphene-based quantum Hall interferometer with self-aligned side gates

Abstract

The vanishing band gap of graphene has long presented challenges for making high-quality quantum point contacts (QPCs) -- the partially transparent p-n interfaces introduced by conventional split-gates tend to short the QPC. This complication has hindered the fabrication of graphene quantum Hall Fabry-Pérot interferometers, until recent advances have allowed split-gate QPCs to operate utilizing the highly resistive $\nu =0$ state. Here, we present a simple recipe to fabricate QPCs by etching a narrow trench in the graphene sheet to separate the conducting channel from self-aligned graphene side gates. We demonstrate operation of the individual QPCs in the quantum Hall regime, and further utilize these QPCs to create and study a quantum Hall interferometer.

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Cited by in corpus (10)

• Anyon braiding and telegraph noise in a graphene interferometer
• Nanoscale electrostatic control in ultra clean van der Waals heterostructures by local anodic oxidation of graphite gates
• Loss and decoherence at the quantum Hall - superconductor interface
• Strongly coupled edge states in a graphene quantum Hall interferometer
• Aharonov-Bohm interference and the evolution of phase jumps in fractional quantum Hall Fabry-Perot interferometers based on bi-layer graphene
• Dissipation and dephasing in quantum Hall interferometers
• Evidence for correlated electron pairs and triplets in quantum Hall interferometers
• Quantum Hall interferometry at finite bias with multiple edge channels
• Spontaneous localization at a potential saddle point from edge state reconstruction in a quantum Hall point contact
• Single electron interference and capacitive edge mode coupling generates ${\Phi }_0/2$ flux periodicity in Fabry-Perot interferometers