Topologically protected surface Majorana arcs and bulk Weyl fermions in ferromagnetic superconductors

Jay D. Sau; Sumanta Tewari

doi:10.1103/PhysRevB.86.104509

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Topologically protected surface Majorana arcs and bulk Weyl fermions in ferromagnetic superconductors

Jay D. Sau, Sumanta Tewari

DOI 10.1103/PhysRevB.86.104509 · Physical Review B

T1

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Abstract

A number of ferromagnetic superconductors have been recently discovered which are believed to be in the so-called “equal spin pairing” state. In the equal spin pairing state, the Cooper pairs condense forming order parameters Δ↑↑,Δ↓↓ which are decoupled in the spin sector. We show that these three-dimensional systems should generically support topologically protected surface Majorana arcs and bulk Weyl fermions as gapless excitations. Similar protected low-energy exotic quasiparticles should also appear in the recently discovered noncentrosymmetric superconductors in the presence of Zeeman splitting. The protected surface arcs can be probed by angle-resolved photoemission as well as Fourier transform scanning tunneling spectroscopy experiments.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
URhGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown