title: Crossed surface flat bands of Weyl semimetal superconductors.
abstract: It has been noted that certain surfaces of Weyl semimetals have bound states forming open Fermi arcs, which are never seen in typical metallic states. We show that the Fermi arcs enable them to support an even more exotic surface state with crossed flat bands in the superconducting state. We clarify the topological origin of the crossed flat bands and the relevant symmetry that stabilizes the cross point. Our symmetry analysis is applicable to known candidate materials of time-reversal breaking Weyl semimetals. We also discuss their possible experimental verification by tunneling spectroscopy.
authors: Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
authors: Bo
authors: B
authors: Lu
authors: Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
authors: Keiji
authors: K
authors: Yada
authors: Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
authors: Masatoshi
authors: M
authors: Sato
authors: Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
authors: Yukio
authors: Y
authors: Tanaka