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Fate of the delocalized states in a vanishing magnetic field

Physical Review Letters, ISSN: 0031-9007, Vol: 74, Issue: 4, Page: 594-597
1995
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We present an experimental study of the fate of the delocalized states as B0 in a disordered two-dimensional electron gas system. Evolving peaks in the longitudinal conductivity xx are used to map out the delocalized states in the density-magnetic-field plane. We demonstrate unambiguously that the energy of the lowest delocalized-state band not only deviates from the "traditional" Landau level center, but also floats up above the Fermi level as B0. © 1995 The American Physical Society.

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