Generation of a nodal line and Weyl points by magnetization reorientation in Co3Sn2S2
Abstract Topological magnets exhibit fascinating physics like topologically protected surface states and anomalous transport. Although these states and phenomena are expected to strongly depend on the magnetic order, their experimental manipulation has been scarcely studied. Here, we demonstrate the magnetic field control of the topological band structure in Co 3 Sn 2 S 2 by magneto-optical spectroscopy. We resolve a magnetic field-induced redshift of the nodal loop resonance as the magnetization is rotated into the kagome plane. Our material-specific theory, capturing the observed field-induced spectral reconstruction, reveals the emergence of a gapless nodal loop for one of the in-plane magnetization directions. The calculations show that the additionally created Weyl points for in-plane fields marginally contribute to the optical response. These findings demonstrate that breaking underlying crystal symmetries with external fields provides an efficient way to manipulate topological band features. Moreover, our results highlight the potential of low-energy magneto-optical spectroscopy in probing variations of quantum geometry.
Authors
- M. Orlita (ORCID: https://orcid.org/0000-0002-9633-507X)
- Ming‐Chun Jiang (ORCID: https://orcid.org/0000-0003-1816-4938)
- László Papp (ORCID: https://orcid.org/0000-0002-9049-9989)
- M. A. Kassem
- Takeshi Waki (ORCID: https://orcid.org/0000-0002-3294-9814)
- Hiroyuki Nakamura (ORCID: https://orcid.org/0000-0001-5514-3007)
- F. Le Mardelé
- I. Mohelsky
- Guang‐Yu Guo (ORCID: https://orcid.org/0000-0003-3097-0916)
- F. Schilberth
- S. Bordács (ORCID: https://orcid.org/0000-0003-0420-5997)
- I. Kézsmárki
- Ryotaro Arita (ORCID: https://orcid.org/0000-0001-5725-072X)
- Y. Tabata
Institutions
- Centre National de la Recherche Scientifique (FR)
- National Taiwan University (TW)
- University of Augsburg (DE)
- Charles University (CZ)
- Kyoto University (JP)
- Budapest University of Technology and Economics (HU)
- Laboratoire National des Champs Magnétiques Intenses (FR)
- National Center for Theoretical Sciences (TW)
- RIKEN Center for Emergent Matter Science (JP)
- National Center for Theoretical Sciences, Physics Division
- The University of Tokyo (JP)
- Université Grenoble Alpes (FR)
- Assiut University (EG)
Publication Details
- Journal
- npj Quantum Materials
- Published
- 2025-07-01
- DOI
- https://doi.org/10.1038/s41535-025-00785-0
- Citations
- 2
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 2.49
Funders
- Deutsche Forschungsgemeinschaft
- Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
- National Science and Technology Council
- RIKEN
- National Research, Development and Innovation Office