Quantum fluctuation and geometrical frustration effects on electric polarization

Tsutomu Watanabe; Sumio Ishihara

doi:10.1143/jpsj.78.113702

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arXiv · 0905.0182

Quantum fluctuation and geometrical frustration effects on electric polarization

Tsutomu Watanabe·Sumio Ishihara

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Abstract

We examine theoretically a possibility of ferroelectricity caused by electronic charge order without inversion symmetry, motivated by layered iron oxides. Quantum electronic models in a paired-triangular lattice are analyzed by utilizing the variational Monte Carlo simulation. Our calculation demonstrates that combined effects of electron transfer between the layers, corresponding to quantum fluctuation between the potential minima, and geometrical frustration promote appearance of an electric polarization. Present results are in contrast to the conventional manner of quantum fluctuation in ferroelectricity.

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Tsutomu Watanabe, Sumio Ishihara. 2009-05-02. Quantum fluctuation and geometrical frustration effects on electric polarization. https://doi.org/10.1143/jpsj.78.113702

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