Phys. Rev. Lett. 98, 266404 (2007) [4 pages]Valley Polarization and Susceptibility of Composite Fermions around a Filling Factor ν=3/2Received 29 March 2007; published 27 June 2007 We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around a Landau level filling factor ν=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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.266404
DOI:
10.1103/PhysRevLett.98.266404
PACS:
71.10.Pm, 71.70.Fk, 73.43.−f
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