SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.61: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Strain control of band topology and surface states in antiferromagnetic EuCd2As2 — •Nayra Alvarez1, Venkata Bharadwaj1, Bennet Karetta1, Rodrigo Jaeschke1, Adrian Valadkhani2, Libor Smejkal1, Jairo Sinova1, and Roser Valenti2 — 1Institut fur Physik, Johannes Gutenberg Universitat, Mainz, Germany — 2Institut für Theoretische Physik, Goethe-Universität, Frankfurt am Main, Germany
We study the effect of strain on EuCd2As2 and the effect on its topological features in different interlayer antiferromagnetic configurations [1]. Magnetic anisotropy calculations indicate that the modulation of the lattice structure with strain can lead to a change in the direction of the magnetic moment changing the topology of the system [2,3]. We performed band structure calculations for the different strained configurations. We consider three different kinds of stress along the x-y plane: volumetric, longitudinal, and shear. In addition, we analyse the surface states at different cleavage surfaces.
[1] J. Ma, H. Wang, S. Nie, et al., "Emergence of nontrivial low-energy Dirac fermions in antiferromagnetic EuCd2As2", Advanced Materials.
[2] G. Hua, S. Nie, et al., "Dirac semimetal in type-IV magnetic space groups", Physical Review B.
[3] E. Gati, S. L. Budko, et al., "Pressure-induced ferromagnetism in the topological semimetal EuCd2As2", Physical Review B.