Square-wave conductance through a chain of rings due to spin-orbit interactionSquare-wave conductance through a chain of rings due to spin-orbit interaction
Faculty of Sciences. Physics
Condensed Matter Theory
2005New York, 2005
AIP conference proceedings / American Institute of Physics. - New York
772(2005), p. 1335-1336
University of Antwerp
We study ballistic electron transport through a finite chain of quantum circular rings in the presence of spin-orbit interaction (SOI) of strength alpha. The transmission and reflection coefficients for a single ring, obtained analytical lylead to the conductance for a chain of rings as a function of alpha and of the wave vector k of the incident electron. Due to destructive spin interferences the chain can be totaly opaque for certain ranges of k the width of which depends on the value of alpha. A periodic modulation of a widens up the gaps considerably and produces a nearly binary conductance output.