Phys. Rev. B 80, 035423 (2009) [5 pages]Density dependence of valley polarization energy for composite fermionsReceived 19 June 2009; published 21 July 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.035423
DOI:
10.1103/PhysRevB.80.035423
PACS:
73.43.−f, 71.10.Pm, 71.70.Fk, 73.21.Fg
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