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Stability of Weyl Node Merging Processes under Symmetry Constraints

Year: 2024
Type: article
Abstract: 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.
DOI: 10.1103/physrevlett.133.196602
Authors: Gabriele Naselli, György Frank, Dániel Varjas, Ion Cosma Fulga, Gergő Pintér, András Pályi, Viktor Könye
Institutions: Leibniz Institute for Solid State and Materials Research, Complexity, Topology and Dynamics in Quantum Matter, Budapest University of Technology and Economics, Max Planck Institute for the Physics of Complex Systems, Institute for Theoretical Physics Amsterdam, University of Amsterdam
Language: English
Open Access status: green
Awards: G1578822270, G1804794778, G1867225360, G1879650195, G2044776484, G2152757567, G5181291137, G5504037695, EXC 2147: Komplexität und Topologie in Quantenmaterialien (CT.QMAT), G765612021
OpenAlex ID: W4404105899
FWCI: 0.796
Cites: 59
Cited by: 5
Related to: 10