Topology and symmetry of surface Majorana arcs in cyclic superconductors

Takeshi Mizushima, Muneto Nitta

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number024506
JournalPhysical Review B
Volume97
Issue number2
DOIs
Publication statusPublished - 2018 Jan 9

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Superconducting materials
topology
arcs
Topology
Surface states
Cones
symmetry
Fermions
cones
Stars
Neutrons
Orbits
Physics
Crystals
admixtures
neutron stars
fermions
orbits
physics
probes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Topology and symmetry of surface Majorana arcs in cyclic superconductors. / Mizushima, Takeshi; Nitta, Muneto.

In: Physical Review B, Vol. 97, No. 2, 024506, 09.01.2018.

Research output: Contribution to journalArticle

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