Response function of a two-dimensional electron gas in a unidirectional periodic potential

Journal Article · Thu Dec 14 23:00:00 EST 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.R17036· OSTI ID:147805

Stewart, S M; Zhang, C ^[1]

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1. Department of Physics, University of Wollongong, New South Wales 2522 (Australia)

The dynamical density-response function of a periodically modulated two-dimensional electron gas under a perpendicular magnetic field is calculated within the random-phase approximation. It is found that the response function is not only broadened by the periodic potential, it also contains a series of subsingularities at the band edges. The maximum number of subsingularities is 2{ital n}{sub max}, where {ital n}{sub max} is the number of occupied Landau levels (the last level may be partially filled). It is further proposed that light-scattering or electromagnetic absorption experiments can be performed to study these predicted structures.

• Sponsoring Organization: USDOE
• OSTI ID: 147805
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 24 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ELECTRON GAS
ENERGY-LEVEL DENSITY
LIGHT SCATTERING
MAGNETIC FIELDS
RANDOM PHASE APPROXIMATION
RESPONSE FUNCTIONS
SINGULARITY
TWO-DIMENSIONAL CALCULATIONS