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Tuning Majorana zero modes with temperature in pi-phase Josephson junctions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Tech Univ Munich, Dept Phys, D-85748 Garching, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 1, article id 014507Article in journal (Refereed) Published
Abstract [en]

We study a superconductor-normal-state-superconductor Josephson junction along the edge of a quantum spin Hall insulator with a superconducting pi phase across the junction. We solve self-consistently for the superconducting order parameter and find both real junctions, where the order parameter is fully real throughout the system, and junctions where the order parameter has a complex phase winding. Real junctions host two Majorana zero modes (MZMs), while phase-winding junctions have no subgap states close to zero energy. At zero temperature we find that the phase-winding solution always has the lowest free energy, which we establish as being due to a strong proximity effect into the N region. With increasing temperature this proximity effect is dramatically decreased and we find a phase transition into a real junction with two MZMs.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 97, no 1, article id 014507
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-341572DOI: 10.1103/PhysRevB.97.014507ISI: 000419760700004OAI: oai:DiVA.org:uu-341572DiVA, id: diva2:1181960
Funder
Carl Tryggers foundation Swedish Research Council, 621-2014-3721Knut and Alice Wallenberg FoundationAvailable from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-02-12Bibliographically approved

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Kuzmanovski, DushkoBlack-Schaffer, Annica M.

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