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Zeitschrift für Physik B Condensed Matter
ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)
Abstract Volume 103 Issue 2 (1997) pp 275-278
Non-Fermi-liquid behavior of compressible electron states on the lowest Landau level
D.V. Khveshchenko
NORDITA, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
Abstract. Experiments show that at even denominator fractions (EDF) (<nu> = 1/2, 3/4, 3/2,...) the two-dimensional electron gas (2DEG) in a strong magnetic field becomes compressible, has no energy gap, and demonstrates the presence of an ostensible Fermi surface (FS). Since this phenomenon results from a minimization of the interaction, rather than the kinetic energy, the EDF states might well exhibit deviations from a conventional Fermi liquid (FL). We show that impurity scattering and its interference with electron-electron and electron-phonon interactions provide examples of intrinsically non-Fermi-liquid (NFL) transport at EDFs.
PACS: 73.40.Hm; 72.10.Bg
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