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VOLUME 55 (1992) | ISSUE 11 | PAGE 665
Suppression of localization in quasi-1 D systems by electromagnetic fluctuations
Localization effects in quasi-1D compounds are suppressed by thermal electromagnetic fluctuations at temperatures 7> fi/[r· (fiVPeL/е2)1/3], where r is the mean free time of an electron with respect to backscattering, eL is the dielectric constant of the lattice in the direction transverse with respect to the conducting chains, and VF is the Fermi velocity. The conductivity can therefore be described by the Drude formula in this case. It is assumed that the condition e2/{eL VFfi) 41 holds, i.e., that the electron-electron interaction is weak. A situation approaching a quasi-1D situation arises in 3D semiconductors and semimetals in high magnetic fields. In this case localization effects are suppressed by thermal fluctuations under the same conditions as in quasi-1D conductors.