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

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

2007-06-08

arxiv.org/abs/0706.1195v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.266404

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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