1303.0661 (Yukinori Yoshimura et al.)

Perfectly conducting channel on the dark surface of weak topological
insulators    [PDF]

Yukinori Yoshimura, Akihiko Matsumoto, Yositake Takane, Ken-Ichiro Imura

A weak topological insulator (WTI) bears, generally, an even number of Dirac cones on its surface; they are susceptible of doubling, while on the surface of a certain orientation it shows no Dirac cone. On this "dark" surface of a WTI, we predict the existence of a single pair of isolated 1D perfectly conducting channels that forms either a closed loop or a segment of a line. The former is associated typically with a single atomic-layer-thick island formed on the dark surface, while the latter is shown to be the consequence of a pair of crystal (screw) dislocations terminating on the dark surface.

View original: http://arxiv.org/abs/1303.0661