Tunable rotons in square-lattice antiferromagnets under strong magnetic fields

Yurika Kubo, Susumu Kurihara

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    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
    Issue number1
    Publication statusPublished - 2014 Jul 17

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials


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