Dresden 2017 – wissenschaftliches Programm
DS 33.1: Vortrag
Mittwoch, 22. März 2017, 15:00–15:15, HSZ 204
Topological properties of magnetic semi-metals with non-symmorphic symmetries — •Andreas P. Schnyder — Max Planck Institute of Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart
Topological semi-metals exhibit band crossings near the Fermi energy, which are protected by the non-trivial topological character of the wave functions. In many cases, these topological band degeneracies give rise to exotic surface states and unusual magneto-transport properties. In this talk, I will discuss this physics in the context of magnetic semi-metals with non-symmorphic symmetries. In particular, I will show that non-symmorphic symmetries of cubic magnetic space groups lead to protected four-fold degenerate Dirac points and Dirac lines. As a concrete example, I will examine the topological properties of the antiferromagnet CuBi2O4 in terms of a low-energy tight-binding model, derived from ab-initio DFT calculations. I will discuss the monopole charges and the associated surface states of this system.