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Spin-dependent transmission through a chain of rings: influence of a periodically modulated spin-orbit interaction strength or ring radius

B. Molnar·P. Vasilopoulos·F. M. Peeters
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Abstract

We study ballistic electron transport through a finite chain of quantum circular rings in the presence of spin-orbit interaction of strength α. For a single ring the transmission and reflection coefficients are obtained analytically and from them the conductance for a chain of rings as a function of αand of the wave vector k of the incident electron. We show that 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 α. A periodic modulation of the strength αor of the ring radius widens up the gaps considerably and produces a nearly binary conductance output.

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B. Molnar, P. Vasilopoulos, F. M. Peeters. 2004-07-20. Spin-dependent transmission through a chain of rings: influence of a periodically modulated spin-orbit interaction strength or ring radius. https://doi.org/10.1063/1.1775283

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