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Domain walls in a chiral d-wave superconductor on the honeycomb lattice
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.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 1, 014521Article in journal (Refereed) Published
Abstract [en]

We perform a fully self-consistent study of domain walls between different chiral domains in chiral d(x2-y2) +/- id(xy) -wave superconductors with an underlying honeycomb lattice structure. We investigate domain walls along all possible armchair and zigzag directions and with a finite global phase shift across the domain wall, in addition to the change of chirality. For armchair domain walls we find the lowest domain wall energy at zero global phase shift, while the most favorable zigzag domain wall has a finite global phase shift dependent on the doping level. Belowthe van Hove singularity the armchair domain wall is most favorable, while at even higher doping the zigzag domain wall has the lowest energy. The domain wall causes a local suppression of the superconducting order parameter, with the superconducting recovery length following a universal curve for all domain walls. Moreover, we always find four subgap states crossing zero energy and well localized to the domain wall. However, the details of their energy spectrum vary notably, especially with the global phase shift across the domain wall.

Place, publisher, year, edition, pages
2017. Vol. 96, no 1, 014521
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-337767DOI: 10.1103/PhysRevB.96.014521ISI: 000412811200003OAI: oai:DiVA.org:uu-337767DiVA: diva2:1173594
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Göran Gustafsson Foundation for Research in Natural Sciences and MedicineKnut and Alice Wallenberg Foundation
Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-12Bibliographically approved

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Awoga, Oladunjoye A.Bouhon, AdrienBlack-Schaffer, Annica M.

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