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Enhanced fluctuations of the tunneling density of states near the bottom of a Landau band measured by a local spectrometer

Research output: Contribution to journalJournal article

Published

  • J P Holder
  • A K Savchenko
  • Vladimir Falko
  • B Jouault
  • G Faini
  • F Laruelle
  • E Bedel
Journal publication date14/02/2000
JournalPhysical review letters
Journal number7
Volume84
Number of pages4
Pages1563-1566
Original languageEnglish

Abstract

We have found that the local density of state fluctuations (LDOSF) in a disordered metal, detected using an impurity in the barrier as a spectrometer, undergo enhanced (with respect to Shubnikov-de Haas and de Haas-van Alphen effects) oscillations in strong magnetic fields, omega(c)tau greater than or equal to 1. We attribute this to the dominant role of the states near the bottom 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 field B in accordance with the results obtained in the diffusion approximation.