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

@article{Bishop2007ValleyPA,
  title={Valley polarization and susceptibility of composite fermions around a filling factor nu=3/2.},
  author={N C Bishop and Medini Padmanabhan and Kaveh Vakili and Yakov Shkolnikov and E P De Poortere and Mansour Shayegan},
  journal={Physical review letters},
  year={2007},
  volume={98 26},
  pages={266404}
}
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… CONTINUE READING