Title
Magneto resistance oscillations in a modulated 2DEG periodic in the ratio h/e to flux per unit cell Magneto resistance oscillations in a modulated 2DEG periodic in the ratio h/e to flux per unit cell
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam :North-Holland ,
Subject
Physics
Engineering sciences. Technology
Source (journal)
Physica. E: Low-dimensional systems and nanostructures. - Amsterdam
Source (book)
15th International Conference on Electronic Properties of, Two-Dimensional Systems (EP2DS-15), JUL 14-18, 2003, Nara, JAPAN
Volume/pages
22(2004) :1-3 , p. 389-393
ISSN
1386-9477
ISI
000221140800094
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Transport properties of the 2DEG are studied in the presence of a normal magnetic field B and of a weak, two-dimensional periodic potential modulation. A tight-binding treatment has shown that each Landau level splits into several subbands with exponentially small gaps between them. Assuming the latter are closed due to disorder gives analytical wave functions and simplifies the evaluation of the magnetoresistance tensor p(muv) The relative phase of the oscillations in p(xx) and p(yy) depends on the modulation strengths and periods. For short periods less than or equal to 100 nm, in addition to the Weiss oscillations, the collisional contribution to the conductivity and the corresponding resistivity contribution show prominent peaks when one flux quantum h/e passes through an integral number of unit cells in good agreement with experiments. For periods 300-400 nm long used in early experiments, these peaks occur at fields 10-25 times smaller than those of the Weiss oscillations and are not resolved. (C) 2003 Elsevier B.V. All rights reserved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/9d50a0/fb38343.pdf
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