QUANTUM CORRECTIONS TO THE CONDUCTIVITY OF FERMION GAUGE-FIELD MODELS - APPLICATION TO THE HALF-FILLED LANDAU LEVEL

摘要

We calculate the Altshuler-Aronov-type quantum correction to the conductivity of 2D charge carriers in a random potential (or random magnetic field) coupled to a transverse gauge held. The gauge fields considered may simulate the effect of the Coulomb interaction for the fractional quantum Hall state at half filling and for the t-J model of high-T-c superconducting compounds. We find an unusually large quantum correction varying linearly or quadratically with the logarithm of temperature, in different temperature regimes. The magnitude of the correction is in good agreement with recent experimental observations at half filling of the Landau level. [References: 40]