Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 33: Transport: Topological Semimetals 2 (jointly with MA/TT)
DS 33.2: Talk
Wednesday, March 22, 2017, 15:15–15:30, HSZ 204
Density wave instabilities and surface state evolution in interacting Weyl semimetals — Manuel Laubach1, Chrstian Platt2, Ronny Thomale3, Titus Neupert4, and •Stephan Rachel1 — 1TU Dresden — 2Stanford University — 3University of Würzburg — 4University of Zürich
We investigate the interplay of many-body and band structure effects of interacting Weyl semimetals (WSM). Attractive and repulsive Hubbard interactions are studied within a model for a time-reversal-breaking WSM with tetragonal symmetry, where we can approach the limit of weakly coupled planes and coupled chains by varying the hopping amplitudes. Using a slab geometry, we employ the variational cluster approach to describe the evolution of WSM Fermi arc surface states as a function of interaction strength. We find spin and charge density wave instabilities which can gap out Weyl nodes. We identify scenarios where the bulk Weyl nodes are gapped while the Fermi arcs still persist, hence realizing a quantum anomalous Hall state.