Effects of an external magnetic field on the gaps and quantum corrections in an ordered Heisenberg antiferromagnet with Dzyaloshinskii-Moriya anisotropy

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dc.creatorChernyshev, A. L.
dc.date2005-08-03
dc.date2005-11-14
dc.date.accessioned2026-07-07T06:41:31Z
dc.date.available2026-07-07T06:41:31Z
dc.descriptionWe study the effects of external magnetic field on the properties of an ordered Heisenberg antiferromagnet with the Dzyaloshinskii-Moriya (DM) interaction. Using the spin-wave theory quantum correction to the energy, on-site magnetization, and uniform magnetization are calculated as a function of the field H and the DM anisotropy constant D. It is shown that the spin-wave excitations exhibit an unusual field-evolution of the gaps. This leads to various non-analytic dependencies of the quantum corrections on H and D. It is also demonstrated that, quite generally, the DM interaction suppresses quantum fluctuations, thus driving the system to a more classical ground state. Most of the discussion is devoted to the spin-S, two-dimensional square lattice antiferromagnet, whose S=1/2 case is closely realized in K2V3O8 where at H=0 the DM anisotropy is hidden by the easy-axis anisotropy but is revealed in a finite field. The theoretical results for the field-dependence of the spin-excitation gaps in this material are presented and the implications for other systems are discussed.
dc.description15+ pages, 14 Figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0508114
dc.identifierhttp://arxiv.org/abs/cond-mat/0508114
dc.identifierPhys. Rev. B 72, 174414 (2005).
dc.identifierdoi:10.1103/PhysRevB.72.174414
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/101693
dc.subjectStrongly Correlated Electrons
dc.titleEffects of an external magnetic field on the gaps and quantum corrections in an ordered Heisenberg antiferromagnet with Dzyaloshinskii-Moriya anisotropy
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