Issue |
Europhys. Lett.
Volume 33, Number 9, March III 1996
|
|
---|---|---|
Page(s) | 683 - 688 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00399-6 | |
Published online | 01 September 2002 |
Internal structure of a Landau band induced by a lateral superlattice: a glimpse of Hofstadter's butterfly
1
Sektion Physik, LMU München - Geschw. Scholl Platz 1, D-80539
München, Germany
2
Department of Electronics, University of Glasgow - Glasgow G12 8QQ, UK
Received:
14
November
1995
Accepted:
1
February
1996
Short-period square lateral superlattices are fabricated on a two-dimensional electron gas located close to the sample surface. For weak potential modulation, band conductivity dominates the low-field magnetoresistance leading to pronounced commensurability oscillations. For increasing potential modulation, band conductivity breaks down and scattering conductivity dominates indicating our beginning to resolve the internal structure of a Landau band. For strong potential modulation the maxima of the Shubnikov-de Haas oscillations split up into submaxima related to the number of flux quanta penetrating a unit cell.
PACS: 71.25.-s – Nonlocalized single-particle electronic states / 73.20.Dx – Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) / 73.50.Jt – Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
© EDP Sciences, 1996
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