Rotons and spin transport in square lattice antiferromagnets in magnetic fields

Yurika Kubo, Susumu Kurihara

    研究成果: Article査読

    抄録

    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.

    本文言語English
    論文番号012116
    ジャーナルJournal of Physics: Conference Series
    592
    1
    DOI
    出版ステータスPublished - 2014

    ASJC Scopus subject areas

    • 物理学および天文学(全般)

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