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Title: Manifestation of the Hofstadter butterfly in far-infrared absorption

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 intrasubband 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 equivalently, on the density of electrons in the system. {copyright} {ital 1996 The American Physical Society.}
Authors:
 [1] ;  [2]
  1. Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik (Iceland)
  2. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstra Se 1, D-70569 Stuttgart (Federal Republic of Germany)
Publication Date:
OSTI Identifier:
385381
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review, B: Condensed Matter; Journal Volume: 54; Journal Issue: 8; Other Information: PBD: Aug 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; ELECTRON GAS; ABSORPTION SPECTRA; PLASMONS; FAR INFRARED RADIATION; SOLID-STATE PLASMA; MAGNETIC FIELDS; OSCILLATOR STRENGTHS; TWO-DIMENSIONAL CALCULATIONS; HARTREE-FOCK METHOD LANDAU LEVELS