Session P23: Superconductivity Theory II: p-wave, chiral, and topological

8:00 AM–11:00 AM, Wednesday, February 29, 2012
Room: 255

Sponsoring Unit: DCMP
Chair: Herbert Fotso, Georgetown University

Abstract ID: BAPS.2012.MAR.P23.6

Abstract: P23.00006 : Topologically protected surface Majorana arcs and bulk Weyl fermions in ferromagnetic superconductors

9:00 AM–9:12 AM

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  Sumanta Tewari
    (Department of Physics and Astronomy, Clemson University, Clemson, SC 29634)

  Jay Sau
    (Department of Physics, Harvard University, Cambridge, MA 02138)

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 3D systems 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 fourier transform scanning tunneling spectroscopty (FT-STS) experiments.

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