Rotons and spin transport in square lattice antiferromagnets in magnetic fields

Yurika Kubo, Susumu Kurihara

    Research output: Contribution to journalArticle

    Abstract

    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
    Volume592
    Issue number1
    DOIs
    Publication statusPublished - 2014

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    rotons
    conductivity
    sidebands
    magnetic fields
    magnons
    excitation
    interactions
    saturation

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Rotons and spin transport in square lattice antiferromagnets in magnetic fields. / Kubo, Yurika; Kurihara, Susumu.

    In: Journal of Physics: Conference Series, Vol. 592, No. 1, 012116, 2014.

    Research output: Contribution to journalArticle

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