Experimental Demonstration of Fermi Surface Effects at Filling Factor [Formula presented]

R. L. Willett, K. W. West, L. N. Pfeiffer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Using small wavelength surface acoustic waves (SAW) on ultrahigh mobility heterostructures, Fermi surface properties are detected at [Formula presented] filling factor at temperatures higher than those at which the quantum Hall state forms. An enhanced conductivity is observed at [Formula presented] by employing sub-0.5-μm SAW, indicating a quasiparticle mean-free path substantially smaller than that in the lowest Landau level. These findings are consistent with the presence of a filled Fermi sea of composite fermions, which may pair at lower temperatures to form the [Formula presented] ground state.

Original languageEnglish (US)
Pages (from-to)4
Number of pages1
JournalPhysical review letters
Issue number6
StatePublished - 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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