Experimental demonstration of a sharp quantum Hall edge

M. Grayson*, M. Huber, M. Rother, W. Biberacher, W. Wegscheider, M. Bichler, G. Abstreiter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This article highlights the history of the quantum Hall edge, focusing on the distinction between sharp and smooth edges. We then introduce an edge-tunneling geometry consisting of two orthogonal quantum wells wherein magnetotunneling measurements at a cleaved-edge overgrown quantum Hall edge are made. Peaks in the tunnel conductance are shown to arise from momentum conserved tunneling into individual quantum Hall edge states. Knowledge of the Fermi momentum of the tunneling electrons determines the real-space distance of the edge states from the tunnel barrier. The results can be interpreted as the first quantifiable evidence of edge states in the sharp quantum Hall edge limit.

Original languageEnglish (US)
Pages (from-to)212-218
Number of pages7
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume25
Issue number2-3 SPEC.ISS.
DOIs
StatePublished - Nov 1 2004

Keywords

  • Cleaved edge overgrowth
  • Edge states
  • Tunnel spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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