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arXiv · 0706.1195

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

N. C. Bishop·M. Padmanabhan·K. Vakili·Y. P. Shkolnikov·E. P. De Poortere·M. Shayegan
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Abstract

We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around 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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N. C. Bishop, M. Padmanabhan, K. Vakili, Y. P. Shkolnikov, E. P. De Poortere, M. Shayegan. 2007-06-08. Valley polarization and susceptibility of composite fermions around nu=3/2. https://doi.org/10.1103/physrevlett.98.266404

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