Spin Triplet Excitations for a Valence Bond Solid on the Kagome Lattice

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dc.creatorYang, Bohm-Jung
dc.creatorKim, Yong Baek
dc.creatorYu, Jaejun
dc.creatorPark, Kwon
dc.date2008-02-29
dc.date.accessioned2026-07-07T10:01:10Z
dc.date.available2026-07-07T10:01:10Z
dc.descriptionOne of the most promising candidate ground states for the quantum antiferromagnetic Heisenberg model on the Kagome lattice is the valence bond solid (VBS) with a 36-site unit cell. We present a theory of triplet excitation spectra about this ground state using bond operator formalism. In particular we obtain dispersions of all 18 triplet modes in the reduced Brillouin zone. In the bond operator mean-field theory, it is found that a large number of triplet modes are non-dispersive. In particular, the lowest triplet excitation is non-dispersive and degenerate with a dispersive mode at the zone center. Away from the zone center, the lowest triplet is separated from two other flat modes by a small energy gap. Quantum fluctuations are considered by taking into account scattering processes of two triplets and their bound state formation, which leads to a downward renormalization of the lowest spin triplet gap. The dispersion of the lowest triplet excitation in the VBS state is compared with the dispersive lower bound of the triplet continuum expected in competing spin liquid phases. Implications to future neutron scattering experiments are discussed.
dc.description11 pages, 8 figures, 1 table
dc.identifierhttps://arxiv.org/abs/0802.4343
dc.identifierhttp://arxiv.org/abs/0802.4343
dc.identifierPhys. Rev. B 77, 224424 (2008) [Editor's Suggestion]
dc.identifierdoi:10.1103/PhysRevB.77.224424
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/168546
dc.subjectStrongly Correlated Electrons
dc.titleSpin Triplet Excitations for a Valence Bond Solid on the Kagome Lattice
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