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Non-Abelian braiding of Weyl nodes via symmetry-constrained phase transitions
Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England..
Stockholm Univ, Nordic Inst Theoret Phys Nordita, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;KTH Royal Inst Technol, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0003-3271-991X
Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England..
Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England..
2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 105, no 8, article id L081117Article in journal (Refereed) Published
Abstract [en]

Weyl semimetals are arguably the most paradigmatic form of a gapless topological phase. While the stability of Weyl nodes, as quantified by their topological charge, has been extensively investigated, recent interest has shifted to the manipulation of the location of these Weyl nodes for non-Abelian braiding. To accomplish this braiding it is necessary to drive significant Weyl node motion using realistic experimental parameter changes. We show that a family of phase transitions characterized by certain symmetry constraints impose that the Weyl nodes have to reorganize by a large amount, shifting from one high-symmetry plane to another. Additionally, for a subset of pairs of nodes with nontrivial Euler class topology, this reorganization can only occur through a braiding process with adjacent nodes. As a result, the Weyl nodes are forced to move a large distance across the Brillouin zone and to braid, all driven by small temperature changes, a process we illustrate with Cd2Re2O7.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 105, no 8, article id L081117
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-310210DOI: 10.1103/PhysRevB.105.L081117ISI: 000766646200004Scopus ID: 2-s2.0-85126012693OAI: oai:DiVA.org:kth-310210DiVA, id: diva2:1648307
Note

QC 20220330

Available from: 2022-03-30 Created: 2022-03-30 Last updated: 2022-06-25Bibliographically approved

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CiteExportLink to record
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