Charge Oscillations in Bilayer Graphene Quantum Confinement Devices

Hailong Fu, Ke Huang, Kenji Watanabe, Takashi Taniguchi, Jun Zhu

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum confinement structures are building blocks of quantum devices in fundamental physics exploration and technological applications. In this work, we fabricate dual-gated bilayer graphene Fabry-Pérot quantum Hall interferometers employing two different gating strategies and conduct finite element simulations to understand the electrostatics of the confinement structures and to guide device design and fabrication. We observe two types of resistance oscillations arising from the charging of quantum dots formed inside the interferometers. We obtain the size, location, and charging energy of the dots by measuring the dependence of the oscillations on the magnetic field, gate voltages, and dc bias. We analyze and discuss the origin of the quantum dots and their impact on quantum Hall edge state backscattering and interference. Insights gained in these studies shed light on the construction of van der Waals quantum confinement devices.

Original languageEnglish (US)
Pages (from-to)9726-9732
Number of pages7
JournalNano letters
Volume23
Issue number21
DOIs
StatePublished - Nov 8 2023

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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