Quantum Dynamics of Multiferroic Helimagnets: a Schwinger-Boson Approach

Abstract

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 fluctuation is collinear in nature which gives rise to the collinear spin density wave state slightly above the helical cycloidal state as the temperature is lowered. Physical properties such as the reduced elliptic ratio of the spiral, the neutron scattering and infrared absorption spectra are discussed from this viewpoint with the possible relevance to the quasi-one dimensional LiCu${}_2$O${}_2$ and LiCuVO${}_4$.

5 pages, 4 figures

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Cited by in corpus (10)

• Cupric chloride CuCl2 as an S=1/2 chain multiferroic
• Studies of Multiferroic System LiCu2O2 I Sample Characterization and Relationship between Magnetic Properties and Multiferroic Nature
• Quantum Fluctuations of Chirality in One-Dimensional Spin-1/2 Multiferroics: Gapless Dielectric Response from Phasons and Chiral Solitons
• Spin amplitude modulation driven magnetoelectic coupling in the new multiferroic FeTe${}_2$O${}_5$Br
• Electronic structure and magnetic properties of Li_2ZrCuO_4 - a spin 1/2 Heisenberg system in vicinity to a quantum critical point
• Schwinger boson theory of ordered magnets
• Observation of S = 1/2 quasi-one-dimensional magnetic and magneto-dielectric behavior in a cubic SrCuTe2O6
• Elementary excitation in the spin-stripe phase in quantum chains
• Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO${}_3$
• Quantum pumping in helimagnet heterostructures