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Bound states of fractionalized excitations in a modulated Kitaev spin liquid
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 5, article id 054401Article in journal (Refereed) Published
Abstract [en]

Fractionalization is a hallmark of spin-liquid behavior; it typically leads to response functions consisting of continua instead of sharp modes. However, microscopic processes can enable the formation of short-distance bound states of fractionalized excitations, despite asymptotic deconfinement. Here we study such bound-state formation for the Z(2) spin liquid realized in Kitaev's honeycomb compass model, supplemented by a kekule distortion of the lattice. Bound states between flux pairs andMajorana fermions form in theMajorana band gaps. We calculate the dynamic spin susceptibility and show that bound states lead to sharp modes in the magnetic response of the spin liquid, with the momentum dependence of the corresponding spectral weight encoding the internal symmetry of the bound state. As a byproduct, we also show that isolated fluxes may produce Majorana bound states at exactly zero energy. Generalizations and implications of the results are discussed.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 5, article id 054401
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-212337DOI: 10.1103/PhysRevB.96.054401ISI: 000406671100003OAI: oai:DiVA.org:kth-212337DiVA, id: diva2:1135576
Note

QC 20170823

Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2017-11-29Bibliographically approved

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