Density and strain dependence of ν=1 energy gap in a valley-degenerate AlAs quantum well

T. Gokmen, Mansour Shayegan

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

In an AlAs quantum well where two-dimensional electrons occupy two conduction-band valleys with anisotropic Fermi contours, we tune the valley splitting energy via the application of strain and measure the energy gaps for the quantum-Hall state at filling factor ν=1. At zero valley splitting energy (strain), there is a sizeable energy gap which increases linearly with density. At a fixed density, the gap rises with increasing strain much faster than the single-particle picture predicts. Interpreting the rapid rise of the gap as a signature of valley Skyrmions, we find that their size grows as the electron density increases.

Original languageEnglish (US)
Article number115336
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number11
DOIs
StatePublished - Mar 31 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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