Manifestation of the Hofstadter butterfly in far-infrared absorption

Vidar Gudmundsson, Rolf R. Gerhardts

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)R5223-R5226
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number8
DOIs
Publication statusPublished - 1996

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