Spin polarization of composite fermions and particle-hole symmetry breaking

Yang Liu, S. Hasdemir, A. Wójs, J. K. Jain, L. N. Pfeiffer, K. W. West, K. W. Baldwin, M. Shayegan

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

We study the critical spin-polarization energy (αC) above which fractional quantum Hall states in two-dimensional electron systems confined to symmetric GaAs quantum wells become fully spin polarized. We find a significant decrease of αC as we increase the well width. In systems with comparable electron layer thickness, αC for fractional states near Landau level filling ν=3/2 is about twice larger than those near ν=1/2, suggesting a broken particle-hole symmetry. Theoretical calculations, which incorporate Landau level mixing through an effective three-body interaction, and finite layer thickness capture certain qualitative features of the experimental results.

Original languageEnglish (US)
Article number085301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number8
DOIs
StatePublished - Aug 8 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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