著者
Okamoto Kiyomi Tonegawa Takashi Sakai Toru
出版者
The Physical Society of Japan
雑誌
Journal of the Physical Society of Japan (ISSN:00319015)
巻号頁・発行日
vol.85, no.6, pp.63704-1-4, 2016-05-23
被引用文献数
5

We investigate the ground-state phase diagram of the bond-alternating <italic>S</italic>= 2 quantum spin chain with the <italic>XXZ</italic>and on-site anisotropies. For the on-site anisotropies, in addition to the popular <inline-formula><tex-math version="MathJax"><![CDATA[\(D_{2}\sum\nolimits_{j} (S_{j}^{z})^{2}\)]]></tex-math></inline-formula>term, we consider the <inline-formula><tex-math version="MathJax"><![CDATA[\(D_{4}\sum\nolimits_{j} (S_{j}^{z})^{4}\)]]></tex-math></inline-formula>term. Mainly we use the exact diagonalization and the level spectroscopy analysis. We show that the Haldane state, large-<italic>D</italic>state and the Dimer2 state belong to the same trivial phase, by finding the existence of adiabatic paths directly connecting these states without the quantum phase transition. Similarly, we show that the intermediate-<italic>D</italic>state and the Dimer1 state belong to the same symmetry protected topological phase.

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