Enhanced fluctuations of the tunneling density of states near the bottom of a landau band measured by a local spectrometer
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>/=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.
Holder
JP
Department of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom.
Savchenko
AK
Fal'ko
VI
Jouault
B
Faini
G
Laruelle
F
Bedel
E