Topological phases in nodeless tetragonal superconductors



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Varona Angulo, Santiago and Ortiz Martín, Laura and Viyuela, O. and Martín-Delgado Alcántara, Miguel Ángel (2018) Topological phases in nodeless tetragonal superconductors. Journal of physics-condensed matter, 30 (39). ISSN 0953-8984

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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, d + id, has been proposed to describe materials such as water-intercalated sodium cobaltates, bilayer silicene or highly doped monolayer graphene.

Item Type:Article
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© 2018 IOP Publishing Ltd. We acknowledge financial support from the Spanish MINECO grants FIS2012-33152, FIS2015-67411, and the CAM research consortium QUITEMAD + , Grant No. S2013/ ICE-2801. The research of MAM-D has been supported in part by the US. Army Research Office through Grant No. W911N F-14-1-0103. OV thanks Hiroki Isobe for interesting discussions, Fundación Ramón Areces and RCC Harvard. SV thanks FPU MECD Grant.

Uncontrolled Keywords:Majorana fermions; Hall; Conductance; States; Model
Subjects:Sciences > Physics > Physics-Mathematical models
ID Code:50621
Deposited On:03 Apr 2019 11:37
Last Modified:03 Apr 2019 11:51

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