arXiv subjects

B. Molnar

Publications and source records attributed to B. Molnar.

2 recordsLinked to original sources

arXiv2004

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

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.

cond-mat.mes-hall↗

arXiv2004

Spin-dependent (magneto)transport through a ring due to spin-orbit interaction

Electron transport through a one-dimensional ring connected with two external leads, in the presence of spin-orbit interaction (SOI) of strength αand a perpendicular magnetic field is studied. Applying Griffith's boundary conditions we derive analytic expressions for the reflection and transmission coefficients of the corresponding one-electron scattering problem. We generalize earlier conductance results by Nitta et al. [Appl. Phys. Lett. 75, 695 (1999)] and investigate the influence of α, temperature, and a weak magnetic field on the conductance. Varying αand temperature changes the position of the minima and maxima of the magnetic-field dependent conductance, and it may even convert a maximum into a minimum and vice versa.

cond-mat.mes-hall↗