Magneto-optical Evidence of the Tilting Effect in Coupled Weyl Bands
Theories have revealed the universality of the band tilting effect in topological Weyl semimetals (WSMs) and its implications for the material physical properties. However, the experimental identification of tilted Weyl bands remains less explored. Here, we report the magneto-optical evidence of the tilting effect in WSM niobium phosphide. Specifically, we observe Landau level transitions with rich features that are well reproduced within a model of coupled tilted Weyl points. Our analysis indicates that the tilting effect relaxes the selection rules and leads to transitions that would otherwise be forbidden in the non-tilt case. Additionally, we observe unconventional interband transitions with flat and negative magnetic field dispersions, highlighting the importance of coupling between Weyl points. Our results not only emphasize the significance of the tilting effect in the optical responses of WSMs but also demonstrate magneto-optics as an effective tool for probing the tilting effect in electronic band structures.
Authors
- Theo Siegrist (ORCID: https://orcid.org/0000-0001-5368-1442)
- Mykhaylo Ozerov (ORCID: https://orcid.org/0000-0002-5470-1158)
- Jennifer Neu (ORCID: https://orcid.org/0000-0003-4392-349X)
- Yuxuan Jiang (ORCID: https://orcid.org/0000-0001-7971-8354)
- Dmitry Smirnov (ORCID: https://orcid.org/0000-0001-6358-3221)
- Zhigang Jiang (ORCID: https://orcid.org/0000-0001-9884-3337)
- Seongphill Moon
Institutions
- Florida State University (US)
- Oak Ridge National Laboratory (US)
- Georgia Institute of Technology (US)
- Florida A&M University - Florida State University College of Engineering (US)
- Anhui University (CN)
- National High Magnetic Field Laboratory (US)
- Center for Free-Electron Laser Science (DE)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-02-07
- DOI
- https://doi.org/10.1021/acs.nanolett.4c06072
- Citations
- 2
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 2.49
Funders
- National Science Foundation
- U.S. Department of Energy
- National High Magnetic Field Laboratory
- National Natural Science Foundation of China
- Anhui Provincial Department of Education
- Natural Science Foundation of Anhui Province
- Division of Materials Research
- High Magnetic Field Laboratory, Chinese Academy of Sciences