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. 2007 Jun 29;98(26):266404.
doi: 10.1103/PhysRevLett.98.266404. Epub 2007 Jun 27.

Valley polarization and susceptibility of composite fermions around a filling factor nu=3/2

N C Bishop  1 , M Padmanabhan, K Vakili, Y P Shkolnikov, E P De Poortere, M Shayegan
Affiliations

Valley polarization and susceptibility of composite fermions around a filling factor nu=3/2

N C Bishop et al. Phys Rev Lett. .

Abstract

We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around a Landau level filling factor nu=3/2, demonstrating that the quasiparticles are composite fermions (CFs) with a valley degree of freedom. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the CF valley susceptibility and polarization. The data can be explained well by a simple Landau level fan diagram for CFs, and are in nearly quantitative agreement with the results reported for CF spin polarization.

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