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

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

2011-10-18

arxiv.org/abs/1110.4110v3

Physics

Condensed Matter

Superconductivity

5 pages and 2 figures; Figure 2 revised, typos corrected

Scientific paper

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.

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