Current-Conserving Aharonov-Bohm Interferometry with Arbitrary Spin Interactions

Details Current-Conserving Aharonov-Bohm Interferometry with Arbitrary Spin Interactions Current-Conserving Aharonov-Bohm Interferometry with Arbitrary Spin Interactions

2011-08-24

arxiv.org/abs/1108.4775v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 13 figures

Scientific paper

We propose a general scattering matrix formalism that guarantees the charge conservation at junctions between conducting arms with arbitrary spin interactions. By using our formalism, we find that the spin-flip scattering can happen even at nonmagnetic junctions if the spin eigenstates in arms are not orthogonal. We apply our formalism to the Aharonov-Bohm interferometer consisting of $n$-type semiconductor ring with both the Rashba spin-orbit coupling and the Zeeman splitting. We discuss the characteristics of the interferometer as conditional/unconditional spin switch in the weak/strong-coupling limit, respectively.

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