Title 



Quantum magnetotransport of a 2dimensional electrongas subject to periodic electric or magnetic modulations
 
Author 



 
Abstract 



Electrical transport properties of the twodimensional electron gas are studied in the presence of a perpendicular magnetic field B = Bz and of a weak onedimensional electric (V0 cos (Kx)) or magnetic (B0 = B0 cos (Kx)z) modulation where B0 << B, K = 2pi/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 Shubnikovde 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 twodimensional 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.   
Language 



English
 
Source (journal) 



Physica scripta: supplements.  Stockholm  
Source (book) 



11TH GENERAL CONF OF THE CONDENSED MATTER DIVISION OF THE EUROPEAN, PHYSICAL SOC, APR 0811, 1991, EXETER, ENGLAND  
Publication 



Stockholm : Royal swedish acad sciences, 1991
 
ISSN 



02811847
 
Volume/pages 



T39(1991), p. 177181
 
ISI 



A1991GV57300028
 
Full text (Publishers DOI) 


  
