Density dependence of valley polarization energy for composite fermions

Medini Padmanabhan, T. Gokmen, M. Shayegan

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


In two-dimensional electron systems confined to wide AlAs quantum wells, composite fermions around the filling factor ν=3/2 are fully spin polarized but possess a valley degree of freedom. Here we measure the energy needed to completely valley polarize these composite fermions as a function of electron density. Comparing our results to the existing theory, we find overall good quantitative agreement but there is an unexpected trend: the measured composite fermion valley polarization energy, normalized to the Coulomb energy, decreases with decreasing density.

Original languageEnglish (US)
Article number035423
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
StatePublished - Aug 6 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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