Tuesday, April 16, 2013

1304.3601 (Teemu Ojanen)

Helical Fermi arcs and surface states in time-reversal invariant Weyl
semimetals
   [PDF]

Teemu Ojanen
Weyl semimetals are gapless three-dimensional topological materials where two bands touch at even number of points in the Brillouin zone. In this work we study a zincblende lattice model realizing a time-reversal invariant Weyl semimetal. The bulk dynamics is decribed by twelve helical Weyl nodes. Surface states form a peculiar quasi two-dimensional helical metal fundamentally different from the Dirac form typical for topological insulators. Allowed direction of velocity and spin of low-energy surface excitations are locked to the cubic symmetry axes. The studied system illustrates general properties of surface states in systems with common crystal symmetries.
View original: http://arxiv.org/abs/1304.3601

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