Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K25: Topological Superconductivities
3:00 PM–6:00 PM,
Tuesday, March 7, 2023
Room: Room 217/218
Sponsoring
Unit:
DCMP
Chair: Dheeraj Sapkota, University of Minnesota Duluth
Abstract: K25.00010 : Weyl superconductivity induced by supercurrent flow*
4:48 PM–5:00 PM
Presenter:
Shuntaro Sumita
(The University of Tokyo)
Authors:
Shuntaro Sumita
(The University of Tokyo)
Kazuaki Takasan
(The University of Tokyo)
Stimulated by the above backgrounds, we propose that Weyl superconductivity can be realized by applying supercurrent to three-dimensional (3D) noncentrosymmetric line-nodal superconductors. We consider a 3D tight-binding model of a tetragonal superconductor in a D+p-wave pairing state with a finite center-of-mass momentum. The original line-nodal structure is modified into a point-nodal one, in which each point node is characterized by a nontrivial Weyl charge, by the cooperating effect of the supercurrent and spin-orbit coupling. In addition, a quantized Berry phase defined on high-symmetry planes characterizes the Weyl nodes when the in-plane supercurrent is considered. Our proposition paves a new way for controlling the superconducting gap structures by using an external field.
*S.S. was supported by JST CREST Grant No. JPMJCR19T2. K.T. was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Contract No. AC02-05CH11231 within the Ultrafast Materials Science Program (KC2203).
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