The response function of a two-dimensional electron gas in a unidirectional spatially periodic magnetic modulation

S. M. Stewart, C. Zhang

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10 Scopus citations


The dynamical dielectric response function and collective excitations of a twodimensional electron gas under a perpendicular magnetic field and in the presence of an additional weak unidirectional spatially modulated periodic magnetic field are calculated within the random-phase approximation It is found that the dynamical dielectric response function is not only broadened by the additional magnetic modulation, but it also contains a series of subsingularities at the band edges. Such broadening of the response function is also found to modify the magnetoplasmon modes of such a system over their unmodulated counterpart. The origin of the new subsingularities is attributed to the magnetic modulation-induced broadening of the energy spectrum. This broadening, being non-uniform, leads to the reintroduction of particle-hole excitations into the dielectric response function. Such fine structures at the band edges are similar in appearance to those recently reported for the case of a weak unidirectional spatially modulated periodic electric potential though however the former may be up to about an order of magnitude larger in bandwidth compared to those seen for the electric case when equal modulation strengths are considered. It is therefore proposed that these new predicted fine structures should be more readily observed in far-infrared spectroscopy experiments over their electric counterpart.
Original languageEnglish (US)
Pages (from-to)6019-6033
Number of pages15
JournalJournal of Physics Condensed Matter
Issue number33
StatePublished - Aug 12 1996
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-15

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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