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

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

Jay D. Sau
(
- Harvard U.
)
,
Sumanta Tewari
(
- Clemson U.
)

2012

5 pages

Published in:

Phys.Rev.B 86 (2012) 104509

e-Print:

1110.4110 [cond-mat.supr-con]

DOI:

10.1103/PhysRevB.86.104509

View in:

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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' (ESP) state. In the ESP state the Cooper pairs condense forming order parameters

\Delta_{\uparrow\uparrow}, \Delta_{\downarrow\downarrow}

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 non-centrosymmteric superconductors in the presence of a Zeeman field. The protected surface arcs can be probed by angle-resolved photoemission (ARPES) as well as scanning tunneling microscope (STM) experiments.

74.25.Jb
71.10.Pm
03.65.Vf
74.20.Rp

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