Title
Magnetoconductance through a chain of rings in the presence of spin-orbit interaction Magnetoconductance through a chain of rings in the presence of spin-orbit interaction
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Singapore ,
Subject
Physics
Source (journal)
International journal of modern physics: B: condensed matter physics, statistical physics, applied physics. - Singapore
Volume/pages
18(2004) :27-29 , p. 3661-3664
ISSN
0217-9792
ISI
000227140200042
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Ballistic electron transport through a finite chain of quantum circular rings is studied in the presence of the Rashba coupling, of strength a, and of a perpendicular magnetic field B. The transmission and reflection coefficients for a single ring, obtained analytically, help obtain the conductance through a chain of rings as a function of the strength a, the field B, and of the wave vector k of the incident electron. Due to destructive spin interferences caused by the Rashba coupling the chain can be totally opaque for certain ranges of k the width of which depends on values of a and B. Outside these ranges the conductance oscillates with high values between e(2)/h and 2e(2)/h. The effect of a periodic modulation of a or B on the conductance gaps is investigated. A periodic, square-wave conductance pattern, pertinent to the development of the spin transistor, results within wide stripes in the parameter space spanned by k, a, and B. Finite temperatures smoothen the square-wave profile of the conductance but do not alter its periodic character.
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