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Tunability of Andreev levels via spin-orbit coupling in Zeeman-split Josephson junctions

Hashimoto, Tatsuko; Golubov, Alexander; Tanaka, Yukio; Linder, Jacob
Journal article, Peer reviewed
Accepted version
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1707.03723.pdf (1.474Mb)
URI
http://hdl.handle.net/11250/2476102
Date
2017
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  • Publikasjoner fra CRIStin - NTNU [41874]
Original version
10.1103/PhysRevB.96.134508
Abstract
We study Andreev reflection and Andreev levels ε in Zeeman-split superconductor/Rashba wire/Zeeman split superconductor junctions by solving the Bogoliubov–de Gennes equation. We theoretically demonstrate that the Andreev levels ε can be controlled by tuning either the strength of Rashba spin-orbit interaction or the relative direction of the Rashba spin-orbit interaction and the Zeeman field. In particular, it is found that the magnitude of the band splitting is tunable by the strength of the Rashba spin-orbit interaction and the length of the wire, which can be interpreted by a spin precession in the Rashba wire. We also find that if the Zeeman field in the superconductor has the component parallel to the direction of the junction, the ε-φ curve becomes asymmetric with respect to the superconducting phase difference φ. Whereas the Andreev reflection processes associated with each pseudospin band are sensitive to the relative orientation of the spin-orbit field and the exchange field, the total electric conductance interestingly remains invariant.
Publisher
American Physical Society
Journal
Physical Review B. Condensed Matter and Materials Physics

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