Quantum kagome antiferromagnet in a magnetic field: Low-lying non-magnetic excitations versus valence-bond crystal order

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dc.creatorCabra, D. C.
dc.creatorGrynberg, M. D.
dc.creatorHoldsworth, P. C. W.
dc.creatorHonecker, A.
dc.creatorPujol, P.
dc.creatorRichter, J.
dc.creatorSchmalfuss, D.
dc.creatorSchulenburg, J.
dc.date2004-04-13
dc.date2005-03-16
dc.date.accessioned2026-07-07T02:57:34Z
dc.date.available2026-07-07T02:57:34Z
dc.descriptionWe study the ground state properties of a quantum antiferromagnet on the kagome lattice in the presence of a magnetic field, paying particular attention to the stability of the plateau at magnetization 1/3 of saturation and the nature of its ground state. We discuss fluctuations around classical ground states and argue that quantum and classical calculations at the harmonic level do not lead to the same result in contrast to the zero-field case. For spin S=1/2 we find a magnetic gap below which an exponential number of non-magnetic excitations are present. Moreover, such non-magnetic excitations also have a (much smaller) gap above the three-fold degenerate ground state. We provide evidence that the ground state has long-range order of valence-bond crystal type with nine spins in the unit cell.
dc.description5 pages including 4 figures, uses REVTeX4; final version with some small extensions; to appear in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0404279
dc.identifierhttp://arxiv.org/abs/cond-mat/0404279
dc.identifierPhys. Rev. B 71, 144420 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.144420
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23719
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleQuantum kagome antiferromagnet in a magnetic field: Low-lying non-magnetic excitations versus valence-bond crystal order
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