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      Spin-wave chirality and its manifestations in antiferromagnets

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          Abstract

          As first demonstrated by Tang and Cohen in chiral optics, the asymmetry in the rate of electromagnetic energy absorption between left and right enantiomers is determined by an optical chirality density [1]. Here, we demonstrate that this effect can exist in magnetic spin systems. By constructing a formal analogy with electrodynamics, we show that in antiferromagnets with broken chiral symmetry the asymmetry in local spin-wave energy absorption is proportional to a spin-wave chirality density, which is a direct counterpart of optical zilch. We propose that injection of a pure spin current into an antiferromagnet may serve as a chiral symmetry breaking mechanism, since its effect in the spin-wave approximation can be expressed in terms of additional Lifshitz invariants. We use linear response theory to show that the spin current induces a nonequilibrium spin-wave chirality density.

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          Quantum Field Theory of Particles with Both Electric and Magnetic Charges

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            V Photon Wave Function

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              An Invariance Property of the Free Electromagnetic Field

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                Author and article information

                Journal
                03 October 2017
                Article
                1710.01023
                7b1333e7-7f47-444c-ae5e-90774809599e

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                6 pages (without Supplemental Material), 1 figure, accepted for publication in Phys. Rev. Lett
                cond-mat.mes-hall

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