Evolution of the 7/2 fractional quantum hall state in two-subband systems

Yang Liu, J. Shabani, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We report the evolution of the fractional quantum Hall state (FQHS) at a total Landau level (LL) filling factor of ν=7/2 in wide GaAs quantum wells in which electrons occupy two electric subbands. The data reveal subtle and distinct evolutions as a function of density, magnetic field tilt angle, or symmetry of the charge distribution. At intermediate tilt angles, for example, we observe a strengthening of the ν=7/2 FQHS. Moreover, in a well with asymmetric change distribution, there is a developing FQHS when the LL filling factor of the symmetric subband ν S equals 5/2 while the antisymmetric subband has a filling factor of 1<ν A<2.

Original languageEnglish (US)
Article number266802
JournalPhysical review letters
Issue number26
StatePublished - Dec 20 2011

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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