Ferromagnetic fractional quantum hall states in a valley-degenerate two-dimensional electron system

Medini Padmanabhan, T. Gokmen, M. Shayegan

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Abstract

We study a two-dimensional electron system where the electrons occupy two conduction band valleys with anisotropic Fermi contours and strain-tunable occupation. We observe persistent quantum Hall states at filling factors ν=1/3 and 5/3 even at zero strain when the two valleys are degenerate. This is reminiscent of the quantum Hall ferromagnet formed at ν=1 in the same system at zero strain. In the absence of a theory for a system with anisotropic valleys, we compare the energy gaps measured at ν=1/3 and 5/3 to the available theory developed for single-valley, two-spin systems, and find that the gaps and their rates of rise with strain are much smaller than predicted.

Original languageEnglish (US)
Article number016805
JournalPhysical review letters
Volume104
Issue number1
DOIs
StatePublished - Jan 7 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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