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Enhanced fluctuations of the tunneling density of states near bottoms of Landau bands measured by a local spectrometer

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arxiv cond-mat/9907018 v1 pith:FLDVNST5 submitted 1999-07-01 cond-mat.mes-hall cond-mat.dis-nn

J.P. Holder , A.K. Savchenko , Vladimir I. Fal'ko , B. Jouault , G. Faini , F. Laruelle , E. Bedel This is my paper
classification cond-mat.mes-hallcond-mat.dis-nn
keywords ldosfstatesbandsbottomsdensityenhancedfieldsfluctuations
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We have found that the local density of states fluctuations (LDOSF) in a disordered metal, detected using an impurity in the barrier as a spectrometer, undergo enhanced (with respect to SdH and dHvA effects) oscillations in strong magnetic fields, omega _c\tau > 1. We attribute this to the dominant role of the states near bottoms of Landau bands which give the major contribution to the LDOSF and are most strongly affected by disorder. We also demonstrate that in intermediate fields the LDOSF increase with B in accordance with the results obtained in the diffusion approximation.

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