Tunable rotons in square-lattice antiferromagnets under strong magnetic fields

Yurika Kubo, Susumu Kurihara

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Excitation spectra of square lattice Heisenberg antiferromagnets in magnetic fields are investigated by the spin-wave theory. It is pointed out that a rotonlike structure appears in a narrow range of magnetic fields as a result of strong nonlinear effects. It is shown that the energy gap and the mass of the "roton" are quite sensitive to the magnetic field: the roton gap softens rapidly and eventually closes as a precursor of a quantum phase transition. The possibility of the experimental observation of the roton and a new ground state after its softening are discussed.

    Original languageEnglish
    Article number014421
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume90
    Issue number1
    DOIs
    Publication statusPublished - 2014 Jul 17

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    rotons
    Magnetic fields
    magnetic fields
    Spin waves
    softening
    Ground state
    magnons
    Energy gap
    Phase transitions
    ground state
    excitation

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Tunable rotons in square-lattice antiferromagnets under strong magnetic fields. / Kubo, Yurika; Kurihara, Susumu.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 1, 014421, 17.07.2014.

    Research output: Contribution to journalArticle

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    AB - Excitation spectra of square lattice Heisenberg antiferromagnets in magnetic fields are investigated by the spin-wave theory. It is pointed out that a rotonlike structure appears in a narrow range of magnetic fields as a result of strong nonlinear effects. It is shown that the energy gap and the mass of the "roton" are quite sensitive to the magnetic field: the roton gap softens rapidly and eventually closes as a precursor of a quantum phase transition. The possibility of the experimental observation of the roton and a new ground state after its softening are discussed.

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