Correlated Double-Electron Additions at the Edge of a Two-Dimensional Electronic System

Ahmet Demir, Neal Staley, Samuel Aronson, Spencer Tomarken, Ken West, Kirk Baldwin, Loren Pfeiffer, Raymond Ashoori

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We create laterally large and low-disorder GaAs quantum-well-based quantum dots that act as small two-dimensional electron systems. We monitor tunneling of single electrons to the dots by means of capacitance measurements and identify single-electron capacitance peaks in the addition spectrum from occupancies of one up to thousands of electrons. The data show two remarkable phenomena in the Landau level filling factor range ν=2 to ν=5 in selective probing of the edge states of the dot: (i) Coulomb blockade peaks arise from the entrance of two electrons rather than one; (ii) at and near ν=5/2 and at fixed gate voltage, these double-height peaks appear uniformly in a magnetic field with a flux periodicity of h/2e, but they group into pairs at other filling factors.

Original languageEnglish (US)
Article number256802
JournalPhysical review letters
Volume126
Issue number25
DOIs
StatePublished - Jun 25 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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