Phys. Rev. Lett. 92, 256801 (2004) [4 pages]Detection of a Landau Band-Coupling-Induced Rearrangement of the Hofstadter ButterflyReceived 27 December 2003; published 22 June 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.256801
DOI:
10.1103/PhysRevLett.92.256801
PACS:
73.43.Qt, 73.21.–b, 73.50.–h, 73.61.–r
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