Topological phases in nodeless tetragonal superconductors. (10th September 2018)

• Record Type: Journal Article
• Authors: Varona, S; Ortiz, L; Viyuela, O; Martin-Delgado, M A
• Is Part Of: Journal of physics. Volume 30:Number 39(2018)
• Publication Date: 2018-09-10
• Subjects: topological superconductors -- topological phases of matter -- edge states -- bulk-edge correspondence; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aadc71
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We compute the topological phase diagram of 2D tetragonal superconductors for the only possible nodeless pairing channels compatible with that crystal symmetry. Subject to a Zeeman field and spin–orbit coupling, we demonstrate that these superconductors show surprising topological features: non-trivial high Chern numbers, massive edge states, and zero-energy modes out of high symmetry points, even though the edge states remain topologically protected. Interestingly, one of these pairing symmetries, , has been proposed to describe materials such as water-intercalated sodium cobaltates, bilayer silicene or highly doped monolayer graphene, which opens the way for further applications of our results.