Rotons and spin transport in square lattice antiferromagnets in magnetic fields

Yurika Kubo, Susumu Kurihara

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    We investigate the excitation spectrum and spin conductivity in square lattice antiferromagnets by nonlinear spin-wave theory. We have found that the excitation spectrum have a rotonlike minimum at about 3/4 of the saturation field. The «roton» appears and softens rapidly to zero as a function of the magnetic field as a result of the especially strong three-magnon interactions. For the spin conductivity, it becomes clear that a two-magnon sideband appears for sufficiently strong three-magnon interactions.

    Original languageEnglish
    Article number012116
    JournalJournal of Physics: Conference Series
    Issue number1
    Publication statusPublished - 2014


    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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