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dc.contributor.authorZhihao, Hao
dc.contributor.authorTchernyshyov, O.
dc.date.accessioned2010-01-11T18:47:43Z
dc.date.available2010-01-11T18:47:43Z
dc.date.issued2009-10-30
dc.identifier.citationPhysical Review Letters 30 Oct. 2009, vol.103, no.18, 187203 (4 pp.)en
dc.identifier.urihttp://jhir.library.jhu.edu/handle/1774.2/33764
dc.description.abstractSpin excitations in an ordered Heisenberg magnet are magnons-bosons with spin 1. That may change when frustration and quantum fluctuations suppress the order and restore the spin-rotation symmetry. We show that spin excitations in the S = 1/2 Heisenberg antiferromagnet on a kagome lattice are spinons-fermions with spin 1/2. In the ground state the system can be described as a collection of small, heavy pairs of spinons with spin 0. A magnetic excitation of lowest energy amounts to breaking up a pair into two spinons at a cost of 0.06 J.en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.subjectordered Heisenberg magneten
dc.subject2D antiferromagnetsen
dc.subjectspin fluctuationsen
dc.subjectmagnonsen
dc.subjectquantum fluctuationsen
dc.subjectspin-rotation symmetryen
dc.subjectfermion systemsen
dc.subjectbosonsen
dc.subjectantiferromagnetic materialsen
dc.subjectHeisenberg antiferromagneten
dc.subjectKagome latticesen
dc.subjectspinonsen
dc.subjectground statesen
dc.subjectmagnetic excitationsen
dc.titleFermionic spin excitations in two- and three-dimensional antiferromagnetsen
dc.typeArticleen


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