Dzyaloshinskii-Moriya interactions in valence bond systems

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dc.creatorTovar, Mayra
dc.creatorRaman, Kumar S.
dc.creatorShtengel, Kirill
dc.date2008-09-01
dc.date2008-10-22
dc.date.accessioned2026-07-07T12:27:30Z
dc.date.available2026-07-07T12:27:30Z
dc.descriptionWe investigate the effect of Dzyaloshinskii-Moriya interactions on the low temperature magnetic susceptibility for a system whose low energy physics is dominated by short-range valence bonds (singlets). Our general perturbative approach is applied to specific models expected to be in this class, including the Shastry-Sutherland model of the spin-dimer compound SrCu_2(BO_3)_2 and the antiferromagnetic Heisenberg model of the recently discovered S=1/2 kagome compound ZnCu_3(OH)_6Cl_2. The central result is that a short-ranged valence bond phase, when perturbed with Dzyaloshinskii-Moriya interactions, will remain time-reversal symmetric in the absence of a magnetic field but the susceptibility will be nonzero in the T\to 0 limit. Applied to ZnCu_3(OH)_6Cl_2, this model provides an avenue for reconciling experimental results, such as the lack of magnetic order and lack of any sign of a spin gap, with known theoretical facts about the kagome Heisenberg antiferromagnet.
dc.description15 pages, 7 figures; An error in version 2 has been corrected which changes our conclusions (Eq. 8 of version 2 does not apply for systems that do not conserve spin)
dc.identifierhttps://arxiv.org/abs/0809.0031
dc.identifierhttp://arxiv.org/abs/0809.0031
dc.identifierPhys. Rev. B 79, 024405 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.024405
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215227
dc.subjectStrongly Correlated Electrons
dc.titleDzyaloshinskii-Moriya interactions in valence bond systems
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