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


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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.



Author: N. C. Bishop; M. Padmanabhan; K. Vakili; Y. P. Shkolnikov; E. P. De Poortere; M. Shayegan

Source: https://archive.org/







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