A1: Tuning topological electronic states and topological magnons

Christine Kuntscher, Joachim Deisenhofer, István Kézsmárki

Within this project we will identify the spectral signatures of the electronic band topology, such as nodal points, lines, planes, and flat bands, in the diagonal and off-diagonal optical conductivity of magnetic semi-metals, with the focus on kagome layer-based materials. The magnetically-driven band reconstruction and the tunability of the topological fermionic states will be studied by optical spectroscopy over a broad frequency range in external magnetic fields and under hydrostatic pressure, respectively. Furthermore, we will search for the signatures of bulk topological magnons and of topologically protected magnon edge states in honeycomb materials, pyrochlore compounds, and kagome magnets by magneto-optical THz spectroscopy.

Publications

2024

Ebad-Allah, J.; Jiang, M. -C.; Borkenhagen, R.; Meggle, F.; Prodan, L.; Tsurkan, V.; Schilberth, F.; Guo, G. -Y.; Arita, R.; Kézsmárki, I.; Kuntscher, C. A.

Optical anisotropy of the kagome magnet FeSn: Dominant role of excitations between kagome and Sn layers Journal Article

Phys. Rev. B 109, L201106, 2024.

Abstract | Links | BibTeX

Optical anisotropy of the kagome magnet FeSn: Dominant role of excitations between kagome and Sn layers

Kunze, J.; Köpf, M.; Cao, Weizheng; Qi, Yanpeng; Kuntscher, C. A.

Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals RAlSi (R=La, Ce, Pr, Nd, Sm) Journal Article

Phys. Rev. B 109, 195130, 2024, Publisher: American Physical Society.

Abstract | Links | BibTeX

Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals RAlSi (R=La, Ce, Pr, Nd, Sm)

2023

Ghara, S.; Barts, E.; Vasin, K.; Kamenskyi, D.; Prodan, L.; Tsurkan, V.; Kézsmárki, I.; Mostovoy, M.; Deisenhofer, J.

Magnetization reversal through an antiferromagnetic state Journal Article

Nat. Commun. 14, 5174, 2023.

Abstract | Links | BibTeX

Magnetization reversal through an antiferromagnetic state

Schilberth, F.; Jiang, M. -C.; Minami, S.; Kassem, M. A.; Mayr, F.; Koretsune, T.; Tabata, Y.; Waki, T.; Nakamura, H.; Guo, G. -Y.; Arita, R.; Kézsmárki, I.; Bordacs, S.

Nodal-line resonance generating the giant anomalous Hall effect of Co3Sn2S2 Journal Article

Phys. Rev. B 107, 214441, 2023.

Abstract | Links | BibTeX

Nodal-line resonance generating the giant anomalous Hall effect of Co3Sn2S2