Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-12-21
Phys. Rev. B 74, 115329 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 8 figures
Scientific paper
10.1103/PhysRevB.74.115329
We investigate the effect of Rashba spin-orbit coupling and of a tunnel barrier on the zero conduc- tance resonances appearing in a one-dimensional conducting Aharonov-Bohm (AB) ring symmet- rically coupled to two leads. The transmission function of the corresponding one-electron problem is derived within the scattering matrix approach and analyzed in the complex energy plane with focus on the role of the tunnel barrier strength on the zero-pole structure characteristic of trans- mission (anti)resonances. The lifting of the real conductance zeros is related to the breaking of the spin-reversal symmetry and time-reversal symmetry of Aharonov-Casher (AC)and AB rings, as well as to rotational symmetry breaking in presence of a tunnel barrier. We show that the polarization direction of transmitted electrons can be controlled via the tunnel barrier strength and discuss a novel spin-filtering design in one-dimensional rings with tunable spin-orbit interaction.
Citro Roberta
Marinaro Maria
Romeo Francesco
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