Fractionally Quantized Berry’s Phase in an Anisotropic Magnet on the Kagome Lattice

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Tohru Kawarabayashi¹^,, Kota Ishii¹, and Yasuhiro Hatsugai²

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¹Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan²Department of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

Received June 26, 2018; Accepted March 4, 2019; Published March 28, 2019

A fractionally quantized Berry phase is examined numerically in an anisotropic spin-1/2 XXZ model on the Kagome lattice. It is shown that the Berry phase has a fractionally quantized and non-zero value when anisotropy is increased, which is consistent with the emergence of the tripartite entangled plaquette phase discussed by J. Carrasquilla et al. [Phys. Rev. B 96, 054405 (2017)].

https://doi.org/10.7566/JPSJ.88.045001

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Fractionally Quantized Berry’s Phase in an Anisotropic Magnet on the Kagome Lattice

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