Manifestation of the Hofstadter butterfly in far-infrared absorption

Details Manifestation of the Hofstadter butterfly in far-infrared absorption Manifestation of the Hofstadter butterfly in far-infrared absorption

1996-07-03

arxiv.org/abs/cond-mat/9607015v1

Phys. Rev. B 54, R5223-R5226 (1996)

Physics

Condensed Matter

RevTeX file + 4 postscript figures, to be published Phys. Rev. B Rapid Comm

Scientific paper

10.1103/PhysRevB.54.R5223

The far-infrared absorption of a two-dimensional electron gas with a square-lattice modulation in a perpendicular constant magnetic field is calculated self-consistently within the Hartree approximation. For strong modulation and short period we obtain intra- and intersubband magnetoplasmon modes reflecting the subbands of the Hofstadter butterfly in two or more Landau bands. The character of the absorption and the correlation of the peaks to the number of flux quanta through each unit cell of the periodic potential depends strongly on the location of the chemical potential with respect to the subbands, or what is the same, on the density of electrons in the system.

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