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

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

1999-07-01

arxiv.org/abs/cond-mat/9907018v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.84.1563

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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