TY - JOUR
T1 - Density dependence of valley polarization energy for composite fermions
AU - Padmanabhan, Medini
AU - Gokmen, T.
AU - Shayegan, M.
N1 - Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/8/6
Y1 - 2009/8/6
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.80.035423
DO - 10.1103/PhysRevB.80.035423
M3 - Article
AN - SCOPUS:69549110280
VL - 80
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 3
M1 - 035423
ER -