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Topology and Magnetism

Date: 2023-04-25
Time: 10:00
Venue: M234
Speaker: Prof. Claudia Felser

(Max Planck Institute Chemical Physics of Solids, Dresden, Germany)


Topology, a mathematical concept, recently became a hot and truly transdisciplinary topic in condensed matter physics, solid state chemistry and materials science. All 200 000 inorganic materials were recently classified into trivial and topological materials, such as topological insulators, Dirac, Weyl and nodal-line semimetals, and topological metals [1]. More than 25% of all materials host topological bands around the Fermi energy. Beyond the single particle picture, we have identified first antiferromagnetic topological materials [2]. Experimentally, we have realized ferromagnetic materials, examples are Co3Sn2S2 and Co2MnGa. Surprisingly all crossings in the band structure of ferromagnets are Weyl nodes or nodal lines [3]. Mn3Sn and YbMnBi2 are examples of non collinear antiferromagnetic Weyl semimetals, which show giant values for the anomalous Hall and Nernst effect [4]. In the context of real space topology, skyrmions and antiskyrmions are a possible new direction for new data storage [5]. Our goal is to identify new quantum-materials for highly efficient spintronics, quantum computing and energy conversion.  


1.Bradlyn et al., Nature 547, 298, (2017), Vergniory, et al., Nature 566 480 (2019), Vergniory, et al., Science accepted arXiv:2105.09954.

2.Xu et al. Nature 586, 702 (2020).

3.Liu, et al. Nature Physics 14, 1125 (2018), Belopolski, et al., Science 365, 1278 (2019), Guin, et al. Advanced Materials 31 (2019) 1806622, Liu, et al., Science 365, 1282 (2019), Morali, et al., Science 365, 1286 (2019)

4.Pan, et al., Nature Materials 21 (2022) 203, Kübler and Felser, EPL 120 (2017) 47002 and EPL108 (2014) 67001, Nayak, et al. Science Advances 2 (2016) e1501870.

5.Nayak et al., Nature 548 (2017) 561.


Claudia Felser is currently the Director of the Max Planck Institute for Chemical Physics of Solids in Dresden, and the vice President of Max Planck Society. She is fellow of the IEEE Magnetic Society, American Physical Society. She is a member of the German National Academy of Sciences, and the German National Academy of Science and Engineering. She is also a member of the United States National Academy of Engineering (NAE) and the United States National Academy of Sciences (NAS). Claudia received many awards, including the APS James C. McGroddy Prize for New Materials (2019), the Max Born Prize of DPG (German Physical Society, 2021), the Liebig Medal of the German Chemical Society (GDCh, 2021). Her research foci are the design, synthesis, and physical characterization of new quantum materials, in particular, Heusler compounds, and topological materials for energy conversion and spintronics.

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