Aharonov–Bohm effect in graphene-based Fabry–Pérot quantum Hall interferometers

Yuval Ronen, Thomas Werkmeister, Danial Najafabadi, Andrew T Pierce, Laurel E Anderson, Young J Shin, Si Young Lee, Young Hee Lee, Bobae Johnson, Kenji Watanabe, Takashi Taniguchi, Amir Yacoby, Philip Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Interferometers probe the wave-nature and exchange statistics of indistinguishable particles—for example, electrons in the chiral one-dimensional edge channels of the quantum Hall effect (QHE). Quantum point contacts can split and recombine these channels, enabling interference of charged particles. Such quantum Hall interferometers (QHIs) can unveil the exchange statistics of anyonic quasi-particles in the fractional quantum Hall effect (FQHE). Here, we present a fabrication technique for QHIs in van der Waals (vdW) materials and realize a tunable, graphene-based Fabry–Pérot (FP) QHI. The graphite-encapsulated architecture allows observation of FQHE at a magnetic field of 3T and precise partitioning of integer and fractional edge modes. We measure pure Aharonov–Bohm interference in the integer QHE, a major technical challenge in small FP interferometers, and find that edge modes exhibit high-visibility interference due to large velocities. Our results establish vdW heterostructures as a versatile alternative to GaAs-based interferometers for future experiments targeting anyonic quasi-particles.

Original languageEnglish
Pages (from-to)563-569
Number of pages8
JournalNature Nanotechnology
Volume16
Issue number5
DOIs
StatePublished - May 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering
  • Biomedical Engineering
  • General Materials Science

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