Density dependence of valley polarization energy for composite fermions

Details Density dependence of valley polarization energy for composite fermions Density dependence of valley polarization energy for composite fermions

2009-07-03

arxiv.org/abs/0907.0508v2

Phys. Rev. B 80, 035423 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.80.035423

In two-dimensional electron systems confined to wide AlAs quantum wells, composite fermions around the filling factor $\nu$ = 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.

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