Title 



Magnetoconductance through a chain of rings in the presence of spinorbit interaction
 
Author 



 
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, squarewave 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 squarewave profile of the conductance but do not alter its periodic character.   
Language 



English
 
Source (journal) 



International journal of modern physics: B: condensed matter physics, statistical physics, applied physics.  Singapore  
Publication 



Singapore : 2004
 
ISSN 



02179792
 
Volume/pages 



18:2729(2004), p. 36613664
 
ISI 



000227140200042
 
Full text (Publishers DOI) 


  
