ELECTRON-ELECTRON INTERACTIONS AND THE HALL INSULATOR

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关键词: MAGNETIC-FIELD;    LANDAU-LEVEL;    WIGNER CRYSTAL;    ANDERSON INSULATOR;    COEFFICIENT;    LIQUID;    PHASE;    LOCALIZATION;    CONDUCTIVITY;    BEHAVIOR;   

DOI  :  10.1103/PhysRevB.50.4984

来源: SCIE

【 摘 要 】

Using the Kubo formula, we show explicitly that a noninteracting electron system cannot behave like a Hall insulator, i.e., a dc resistivity matrix p(xx) --> infinity and finite p(xy) in the zero-temperature limit, as has been observed recently in experiment. For a strongly interacting electron system in a magnetic field, we illustrate, by constructing a specific form of correlations between mobile and localized electrons, that the Hall resistivity can approximately equal its classical value. A Hall insulator is realized in this model when the density of mobile electrons becomes vanishingly small. It is shown that in noninteracting electron systems, the zero-temperature frequency-dependent conductance generally does not give the de conductance.

【 授权许可】

Free