Stability of Weyl Node Merging Processes under Symmetry Constraints
Changes in the number of Weyl nodes in Weyl semimetals occur through merging processes, usually involving a pair of oppositely charged nodes. More complicated processes involving multiple Weyl nodes are also possible, but they typically require fine tuning and are thus less stable. In this Letter, we study how symmetries affect the allowed merging processes and their stability, focusing on the combination of a twofold rotation and time-reversal (C_{2}T) symmetry. We find that, counterintuitively, processes involving a merging of three nodes are more generic than processes involving only two nodes. Our Letter suggests that multi-Weyl merging may be observed in a large variety of quantum materials, and we discuss SrSi_{2} and bilayer graphene as potential candidates.
Authors
- Ion Cosma Fulga (ORCID: https://orcid.org/0000-0003-2249-039X)
- András Pályi (ORCID: https://orcid.org/0009-0002-1894-0415)
- Gabriele Naselli (ORCID: https://orcid.org/0000-0002-7398-611X)
- G. Pintér (ORCID: https://orcid.org/0000-0003-1289-0592)
- György Frank (ORCID: https://orcid.org/0000-0003-2129-2105)
- Dániel Varjas (ORCID: https://orcid.org/0000-0002-3283-6182)
- Viktor Könye (ORCID: https://orcid.org/0000-0003-2900-9212)
Institutions
- Budapest University of Technology and Economics (HU)
- Leibniz Institute for Solid State and Materials Research (DE)
- Complexity, Topology and Dynamics in Quantum Matter (DE)
- Max Planck Institute for the Physics of Complex Systems (DE)
- University of Amsterdam (NL)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2024-11-06
- DOI
- https://doi.org/10.1103/physrevlett.133.196602
- Citations
- 4
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 1.35
Funders
- Deutsche Forschungsgemeinschaft
- Nemzeti Kutatási Fejlesztési és Innovációs Hivatal