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We present an experimental study of the fate of the delocalized states as B→0 in a disordered two-dimensional electron gas system. Evolving peaks in the longitudinal conductivity σₓₓ 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 B→0.
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Glozman et al. (1995) studied this question.
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