Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Topological Semimetals II
TT 20.10: Vortrag
Montag, 12. März 2018, 17:30–17:45, A 053
Creating and Controlling Dirac Fermions, Weyl Fermions, and Nodal Lines in the Magnetic Antiperovskite Eu3PbO — •Moritz M. Hirschmann1, Alexandra S. Gibbs2, Vahideh Abdolazimi1, Alexander Yaresko1, Hidenori Takagi1,3,4, Andreas W. Rost1,3, and Andreas P. Schnyder1 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2ISIS Pulsed Neutron Facility, Didcot, United Kingdom — 3FMQ, Universität Stuttgart, Germany — 4Department of Physics, The University of Tokyo, Japan
Anti-perovskite materials A3EO, where A denotes an alkaline earth metal, while E stands for Pb or Sn, exhibit low-energy electronic properties that are described by three-dimensional Dirac fermions, which are gapped out by spin-orbit coupling [1,2]. If A is replaced by the rare-earth element europium then magnetic order is expected due to the electron spin moment as confirmed by magnetization measurements. Neutron diffraction leads us to the conclusion that different magnetic phases appear. We studied the effect of magnetism on the electronic properties of Eu3PbO. From DFT calculations the resulting splitting has been extracted and implemented into a tight-binding model to capture the physics close to the Fermi energy. We present the creation of Weyl points and nodal lines and give their topological invariants. For the different magnetic phases we derived the respective surface states and anomalous Hall responses.
[1] T. H. Hsieh, J. Liu, L. Fu. Phys. Rev. B, 90 (2014) 08111.
[2] D. Samal, H. Nakamura, H. Takagi. APL Mater. 4 (7), 2016.