Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Topological Semimetals II

TT 20.8: Vortrag

Montag, 12. März 2018, 17:00–17:15, A 053

Weyl semimetals with single Weyl nodes, and the fate of their chiral anomaly — •Tobias Meng and Jan Carl Budich — Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany

Weyl semimetals are defined by the presence of isolated points in the Brillouin zone at which a conduction and a valence band touch. The so-called Nielsen-Ninomiya-theorem requires these points (the ``Weyl nodes'') to appear in pairs. This theorem, however, is only valid for interactions of sufficiently short range. In this talk, I discuss that long-range interactions can break the Nielsen-Ninomiya-theorem, and illustrate this point by an explicit construction of an interacting tight-binding model that contains only a single Weyl node. I will then demonstrate that the chiral magnetic effect remains intact for arbitrary interactions in such a single node Weyl semimetal. In particular, already an infinitesimal magnetic field restores a pair of chiral Landau levels of opposite chirality.