NON-FERMI-LIQUID BEHAVIOR OF COMPRESSIBLE ELECTRON-STATES ON THE LOWEST LANDAU-LEVEL

Experiments show that at even denominator fractions (EDF) (nu = 1/2, 3 /4, 3/2,...) the two-dimensional electron gas (2DEG) in a strong magne tic field becomes compressible, has no energy gap, and demonstrates th e presence of an ostensible Fermi surface (FS). Since this phenomenon results from a minimization of the interaction, rather than the kineti c energy, the EDF states might well exhibit deviations from a conventi onal Fermi liquid (FL). We show that impurity scattering and its inter ference with electron-electron and electron-phonon interactions provid e examples of intrinsically non-Fermi-liquid (NFL) transport at EDFs.