Detecting topological superconductivity with phi(0) Josephson junctions

Schrade, Constantin and Hoffman, Silas and Loss, Daniel. (2017) Detecting topological superconductivity with phi(0) Josephson junctions. Physical Review B, 95 (19). p. 195421.

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Official URL: https://edoc.unibas.ch/87730/

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The recent experimental discovery of phi(0) Josephson junctions by Szombati et al. [Nat. Phys. 12, 568 (2016)], characterized by a finite phase offset in the supercurrent, requires the same ingredients as topological superconductors, which suggests a profound connection between these two distinct phenomena. Here, we show that a quantum dot phi(0)Josephson junction can serve as a qualitative indicator for topological superconductivity: microscopically, we find that the phase shift in a junction of s-wave superconductors is due to the spin-orbit induced mixing of singly occupied states on the quantum dot, while for a topological superconductor junction it is due to singlet-triplet mixing. Because of this important difference, when the spin-orbit vector of the quantum dot and the external Zeeman field are orthogonal, the s-wave superconductors form a pi Josephson junction, while the topological superconductors have a finite offset phi(0) by which topological superconductivity can be distinguished from conventional superconductivity. Our prediction can be immediately tested in nanowire systems currently used for Majorana fermion experiments and thus offers a realistic approach for detecting topological bound states.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Apr 2022 14:54
Deposited On:06 Apr 2022 14:54

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