▎ 摘　　要

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 circuit the QPCs. This complication has hindered the fabrication of graphene quantum Hall Fabry-Perot interferometers, until recent advances have allowed split-gate QPCs to operate utilizing the highly resistive v = 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.