Josephson effect in normal and ferromagnetic topological-insulator junctions : planar, step, and edge geometries

Nussbaum, Jennifer and Schmidt, Thomas L. and Bruder, Christoph and Tiwari, Rakesh P.. (2014) Josephson effect in normal and ferromagnetic topological-insulator junctions : planar, step, and edge geometries. Physical review. B, Condensed matter and materials physics, Vol. 90, H. 4 , 045413.

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Official URL: http://edoc.unibas.ch/dok/A6338906

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We investigate Josephson junctions on the surface of a three-dimensional topological insulator in planar, step, and edge geometries. The elliptical nature of the Dirac cone representing the side surface states of the topological insulator results in a scaling factor in the Josephson current in a step junction as compared to the planar junction. In edge junctions, the contribution of the Andreev bound states to the Josephson current vanishes due to spin-momentum locking of the surface states. Furthermore, we consider a junction with a ferromagnetic insulator between the superconducting regions. In these ferromagnetic junctions, we find an anomalous finite Josephson current at zero phase difference if the magnetization is pointing along the junction (and perpendicular to the Josephson current). An out-of-plane magnetization with respect to the central region of the junction opens up an exchange gap and leads to a nonmonotonic behavior of the critical Josephson current for sufficiently large magnetization as the chemical potential increases.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bruder, Christoph and Tiwari, Rakesh and Schmidt, Thomas and Nussbaum, Jennifer
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Mar 2015 07:44
Deposited On:06 Mar 2015 07:44

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