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Multigap topology and non-Abelian braiding of phonons from first principles
Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England..
Stockholm Univ, Nordita SU, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden..
Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England..ORCID iD: 0000-0001-9055-5218
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 085115Article in journal (Refereed) Published
Abstract [en]

Non-Abelian states of matter, in which the final state depends on the order of the interchanges of two quasipar-ticles, can encode information immune from environmental noise with the potential to provide a robust platform for topological quantum computation. We demonstrate that phonons can carry non-Abelian frame charges at the band-crossing points of their frequency spectrum, and that external stimuli can drive their braiding. We present a general framework to understand the topological configurations of phonons from first-principles calculations using a topological invariant called Euler class, and provide a complete analysis of phonon braiding by combining different topological configurations. Taking a well-known dielectric material Al2O3 as a representative example, we demonstrate that electrostatic doping gives rise to phonon band inversions that can induce redistribution of the frame charges, leading to non-Abelian braiding of phonons. Our work provides a quasiparticle platform for realizable non-Abelian braiding in reciprocal space, and expands the tool set for studying braiding processes.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 105, no 8, article id 085115
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-309816DOI: 10.1103/PhysRevB.105.085115ISI: 000754683200001Scopus ID: 2-s2.0-85124621126OAI: oai:DiVA.org:kth-309816DiVA, id: diva2:1644610
Note

QC 20220315

Available from: 2022-03-15 Created: 2022-03-15 Last updated: 2022-06-25Bibliographically approved

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Slager, Robert-Jan
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