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Anyonic quantum spin chains: Spin-1 generalizations and topological stability
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 23, 235120- p.Article in journal (Refereed) Published
Abstract [en]

There are many interesting parallels between systems of interacting non-Abelian anyons and quantum magnetism occurring in ordinary SU(2) quantum magnets. Here we consider theories of so-called SU(2)(k) anyons, well-known deformations of SU(2), in which only the first k + 1 angular momenta of SU(2) occur. In this paper, we discuss in particular anyonic generalizations of ordinary SU(2) spin chains with an emphasis on anyonic spin S = 1 chains. We find that the overall phase diagrams for these anyonic spin-1 chains closely mirror the phase diagram of the ordinary bilinear-biquadratic spin-1 chain including anyonic generalizations of the Haldane phase, the AKLT construction, and supersymmetric quantum critical points. A novel feature of the anyonic spin-1 chains is an additional topological symmetry that protects the gapless phases. Distinctions further arise in the form of an even/odd effect in the deformation parameter k when considering su(2)(k) anyonic theories with k >= 5, as well as for the special case of the su(2)(4) theory for which the spin-1 representation plays a special role. We also address anyonic generalizations of spin-1/2 chains with a focus on the topological protection provided for their gapless ground states. Finally, we put our results into the context of earlier generalizations of SU(2) quantum spin chains, in particular so-called (fused) Temperley-Lieb chains.

Place, publisher, year, edition, pages
American Physical Society , 2013. Vol. 87, no 23, 235120- p.
Keyword [en]
Conformal Field-Theory, 2 Dimensions, Antiferromagnetic S, Potts-Model, Statistics, Invariance, Lattices, Symmetry, Algebra, Fusion
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-124726DOI: 10.1103/PhysRevB.87.235120ISI: 000320605600001ScopusID: 2-s2.0-84879726135OAI: diva2:638385

QC 20130730

Available from: 2013-07-30 Created: 2013-07-29 Last updated: 2013-08-27Bibliographically approved

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Ardonne, Eddy
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