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Dynamics of fractionalization in quantum spin liquids

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Title: Dynamics of fractionalization in quantum spin liquids
Authors: Knolle, J
Kovrizhin, DL
Chalker, JT
Moessner, R
Item Type: Journal Article
Abstract: We present the theory of dynamical spin response for the Kitaev honeycomb model, obtaining exact results for the structure factor (SF) in gapped and gapless, Abelian and non-Abelian quantum spin-liquid (QSL) phases. We also describe the advances in methodology necessary to compute these results. The structure factor shows signatures of spin fractionalization into emergent quasiparticles: Majorana fermions and fluxes of Z 2 gauge field. In addition to a broad continuum from spin fractionalization, we find sharp ( δ -function) features in the response. These arise in two distinct ways: from excited states containing only (static) fluxes and no (mobile) fermions, and from excited states in which fermions are bound to fluxes. The SF is markedly different in Abelian and non-Abelian QSLs, and bound fermion-flux composites appear only in the non-Abelian phase.
Issue Date: 14-Sep-2015
Date of Acceptance: 10-Jul-2015
URI: http://hdl.handle.net/10044/1/54763
DOI: https://dx.doi.org/10.1103/PhysRevB.92.115127
ISSN: 1098-0121
Publisher: American Physical Society
Journal / Book Title: Physical review B: Condensed matter and materials physics
Volume: 92
Issue: 11
Copyright Statement: Dynamics of fractionalization in quantum spin liquids J. Knolle, D. L. Kovrizhin, J. T. Chalker, and R. Moessner Phys. Rev. B 92, 115127 – Published 14 September 2015
Keywords: Science & Technology
Physical Sciences
Physics, Condensed Matter
Physics
CHAIN
EXCITATIONS
SCATTERING
METALS
PHASE
MODEL
STATE
BAND
cond-mat.str-el
Publication Status: Published
Article Number: 115127
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences



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