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Detection of a Landau band-coupling-induced rearrangement of the Hofstadter butterfly
M C Geisler1, J H Smet, V Umansky
1Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany.
Abstract:
The spectrum of 2D electrons subjected to a weak 2D potential and a perpendicular magnetic field is composed of Landau bands with a fractal internal pattern of subbands and minigaps referred to as Hofstadter's butterfly. The Hall conductance may serve as a spectroscopic tool as each filled subband contributes a specific quantized value. Advances in sample fabrication now finally offer access to the regime away from the limiting case of a very weak potential. Complex behavior of the Hall conductance is observed and assigned to Landau band-coupling-induced rearrangements within the butterfly.
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