Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-09-19
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.88.066801
Using small wavelength surface acoustic waves (SAW) on ultra-high mobility heterostructures, Fermi surface properties are detected at 5/2 filling factor at temperatures higher than those at which the quantum Hall state forms. An enhanced conductivity is observed at 5/2 by employing sub 0.5 micron wavelength 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 5/2 ground state.
Pfeiffer Loren N.
West Ken. W.
Willett R. L.
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