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TT: Fachverband Tiefe Temperaturen
TT 23: Topological Insulators and Weyl Semimetals (joint session MA/TT)
TT 23.4: Talk
Tuesday, March 19, 2024, 10:15–10:30, H 2013
Strain control on band topology and surface states in antiferromagnetic EuCd2As2 — •Nayra Alvarez1, Rodrigo Jaeschke1, Venkata Krishna1, Adrian Valadkhani2, Roser Valenti2, Libor Smejkal1, and Jairo Sinova1,3 — 1Institut für Physik, Johannes Gutenberg Universität — 2Institut für Theoretische Physik, Goethe-Universität Frankfurt — 3Inst. of Physics Academy of Sciences of the Czech Republic
Topological semimetal antiferromagnets provide a rich source of exotic topological states which can be controlled by manipulating the orientation of the Neel vector, or by modulating the lattice parameters through strain. We investigate via ab initio density functional theory calculations, the effects of shear strain on the bulk and surface states in two antiferromagnetic EuCd2As2 phases with out-of-plane and in-plane spin configurations. We demonstrate the control of the band topology and how they can lead to hinge modes as well, which may prove useful to realize the long-sought after axion states and to stimulate further research in the field of strain effects on Dirac semimetals[1].
[1] Pari, Nayra A. Álvarez, et al. "Strain control of band topology and surface states in antiferromagnetic EuCd2As2." arXiv preprint arXiv:2310.19186 (2023)
Keywords: Dirac Semimetal; Axion Insulator; Higher order Topological Insulator; Strain effects; Band Topology