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Quantum Dynamics of Multiferroic Helimagnets: a Schwinger-Boson Approach
Hosho Katsura, Shigeki Onoda, Jung Hoon Han +1
We study the quantum dynamics/fluctuation of the cycloidal helical magnet in terms of the Schwinger boson approach. In sharp contrast to the classical fluctuation, the quantum fluc…
Nematic and chiral orders for planar spins on triangular lattice
Jin-Hong Park, Shigeki Onoda, Naoto Nagaosa +1
We propose a variant of the antiferromagnetic XY model on the triangular lattice to study the interplay between the chiral and nematic orders in addition to the magnetic order. The…
Quantum Fluctuations of Chirality in One-Dimensional Spin-1/2 Multiferroics: Gapless Dielectric Response from Phasons and Chiral Solitons
Shunsuke Furukawa, Masahiro Sato, Yasuhiro Saiga +1
We present a quantum theory for one-dimensional spin-1/2 multiferroics, where the vector spin chirality couples with the electric polarization. Based on exact diagonalization and b…