Haldane, large- and intermediate- states in an =2 quantum spin chain with on-site and anisotropies

Tonegawa, Takashi*; Okamoto, Kiyomi*; Nakano, Hiroki*; Sakai, Toru; Nomura, Kiyohide*; Kaburagi, Makoto*

Journal of the Physical Society of Japan, 80(4), p.043001_1 - 043001_4, 2011/04

https://doi.org/10.1143/JPSJ.80.043001

Using mainly numerical method, we investigate the ground-state phase diagram of the =2 quantum spin chain with on-site and anisotropies. As a result we found a new phase between the well-known Haldane phase and the large- phase. The precise phase diagram is presented by the level spectroscopy method.