Observation of collective and single-particle effects in conductance oscillations in a ‘quantum donut’

Scott Yang, A. S. Adourian, M. J. Berry, R. M. Westervelt, A. C. Gossard, K. L. Campman

Research output: Contribution to journalArticle

Abstract

A ‘quantum donut’ device with quantum point contacts and an independently tunable center gate was fabricated in a GaAs/Al0.3Ga0.7As heterostructure. The low temperature magnetoconductance in the tunneling regime shows two sets of oscillations at high magnetic fields: one corresponds to the area enclosed by the outer diameter, associated with Aharonov-Bohm-like edge state interference, and one corresponds to the area of the annulus, associated with oscillations in the self-consistent electron distribution due to Landau level depopulations.

Original languageEnglish (US)
Pages (from-to)235-238
Number of pages4
JournalSuperlattices and Microstructures
Volume16
Issue number3
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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