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TT: Fachverband Tiefe Temperaturen

TT 76: Poster Session: Transport 2

TT 76.12: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG1

Topological semimetals and insulators in three-dimensional honeycomb materials — •Dennis Wawrzik, David Lindner, Maria Hermanns, and Simon Trebst — Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany

In Fermi liquid theory, conventional metals are described via their (d-1)-dimensional Fermi surface for an electronic lattice structure in d spatial dimensions. With the discovery of Dirac matter, most prominently in graphene and on the surfaces of topological insulators, semimetals have become the subject of intense research efforts. In these semimetals, conduction and valence bands touch only at a discrete set of points or along nodal lines (for three-dimensional structures). Here we discuss a family of three-dimensional honeycomb structures that exhibit a variety of topological (semi)metals with Weyl nodes, Dirac nodal lines or flat bands arising already in simple electronic tight-binding models. In the presence of spin-orbit coupling some of these structures give rise to topological insulators. Our classification of these states can be understood from an elementary symmetry analysis of the underlying lattice structures.