Title
Quantum magnetotransport of a 2-dimensional electron-gas subject to periodic electric or magnetic modulations
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Stockholm :Royal swedish acad sciences ,
Subject
Physics
Source (journal)
Physica scripta: supplements. - Stockholm
Source (book)
11TH GENERAL CONF OF THE CONDENSED MATTER DIVISION OF THE EUROPEAN, PHYSICAL SOC, APR 08-11, 1991, EXETER, ENGLAND
Volume/pages
T39(1991) , p. 177-181
ISSN
0281-1847
ISI
A1991GV57300028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Electrical transport properties of the two-dimensional electron gas are studied in the presence of a perpendicular magnetic field B = Bz and of a weak one-dimensional electric (V0 cos (Kx)) or magnetic (B0 = B0 cos (Kx)z) modulation where B0 << B, K = 2-pi/a, and a is the modulation period. In either case the discrete Landau levels broaden into bands whose width: (1) is proportional to the modulation strength, (2) it oscillates with B, and (3) it gives rise to magnetoresistance oscillations, at low B, that are different in period and temperature dependence from the Shubnikov-de Haas (SdH) ones, at higher B. For equal energy modulation strengths, V0 = heB0/m*, the magnetic bandwidth at the Fermi energy is about one order of magnitude larger than the electric one. The same holds for the oscillation amplitude of the electrical magnetoresistivity tensor. For two-dimensional modulations the energy spectrum has the same structure but with different scales. For weak magnetic fields and equal modulation strengths the gaps in the spectrum can be much larger in the magnetic case thus making easier the observability of the spectrum's fine structure.
E-info
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