Dynamical magneto-electric coupling in helical magnets

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dc.creatorKatsura, Hosho
dc.creatorBalatsky, Alexander V.
dc.creatorNagaosa, Naoto
dc.date2006-02-23
dc.date.accessioned2026-07-07T07:42:44Z
dc.date.available2026-07-07T07:42:44Z
dc.descriptionCollective mode dynamics of the helical magnets coupled to electric polarization via spin-orbit interaction is studied theoretically. The soft modes associated with the ferroelectricity are not the transverse optical phonons, as expected from the Lyddane-Sachs-Teller relation, but are the spin waves hybridized with the electric polarization. This leads to the Drude-like dielectric function $ε(ω)$ in the limit of zero magnetic anisotropy. There are two more low-lying modes; phason of the spiral and rotation of helical plane along the polarization axis. The roles of these soft modes in the neutron scattering and antiferromagnetic resonance are revealed, and a novel experiment to detect the dynamical magneto-electric coupling is proposed.
dc.description5 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/cond-mat/0602547
dc.identifierhttp://arxiv.org/abs/cond-mat/0602547
dc.identifierPhys. Rev. Lett. 98, 027203 (2007)
dc.identifierdoi:10.1103/PhysRevLett.98.027203
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/122552
dc.subjectStrongly Correlated Electrons
dc.titleDynamical magneto-electric coupling in helical magnets
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