Topology and symmetry of surface Majorana arcs in cyclic superconductors

Takeshi Mizushima, Muneto Nitta

研究成果: Article査読

18 被引用数 (Scopus)


We study the topology and symmetry of surface Majorana arcs in superconductors with nonunitary "cyclic" pairing. Cyclic p-wave pairing may be realized in a cubic or tetrahedral crystal, while it is a candidate for the interior P23 superfluids of neutron stars. The cyclic state is an admixture of full gap and nodal gap with eight Weyl points and the low-energy physics is governed by itinerant Majorana fermions. We here show the evolution of surface states from Majorana cone to Majorana arcs under rotation of surface orientation. The Majorana cone is protected solely by an accidental spin rotation symmetry and fragile against spin-orbit coupling, while the arcs are attributed to two topological invariants: the first Chern number and one-dimensional winding number. Lastly, we discuss how topologically protected surface states inherent to the nonunitary cyclic pairing can be captured from surface probes in candidate compounds, such as U1-xThxBe13. We examine tunneling conductance spectra for two competitive scenarios in U1-xThxBe13 - the degenerate Eu scenario and the accidental scenario.

ジャーナルPhysical Review B
出版ステータスPublished - 2018 1月 9

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


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