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Journal Article

Detection of a Landau band-coupling-induced rearrangement of the Hofstadter butterfly

MPS-Authors
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Geisler,  M. C.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280531

Smet,  J. H.
Research Group Solid State Nanophysics (Jurgen H. Smet), Max Planck Institute for Solid State Research, Max Planck Society;
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280605

von Klitzing,  K.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Geisler, M. C., Smet, J. H., Umansky, V., von Klitzing, K., Naundorf, B., Ketzmerick, R., et al. (2004). Detection of a Landau band-coupling-induced rearrangement of the Hofstadter butterfly. Physical Review Letters, 92(25): 256801.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FEC6-5
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.