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Okamoto, Kiyomi*; Tonegawa, Takashi*; Sakai, Toru; Kaburagi, Makoto*
JPS Conference Proceedings (Internet), 3, p.014022_1 - 014022_7, 2014/06
The S=2 quantum spin chain with the XXZ anisotropy and the on-site anisotropy is investigated by the numerical diagonalization and density matrix renormalization group analysis. As a result, it was found that an edge mode appears in the intermediate-D phase, while not in the large-D phase.
and intermediate- states in an 
=2 quantum spin chain with on-site and 
anisotropiesTonegawa, 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
Times Cited Count：40 Percentile：82.21(Physics, Multidisciplinary)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.
)=(1,2) spin-alternating chainTonegawa, Takashi*; Sakai, Toru; Okamoto, Kiyomi*; Kaburagi, Makoto*
Journal of the Physical Society of Japan, 76(12), p.124701_1 - 124701_8, 2007/12
Times Cited Count：7 Percentile：44.09(Physics, Multidisciplinary)Applying the numerical diagonalization and the density matrix renormalization for the (1,2) spin alternating chain, we found two different mechanisms of the 1/3 magnetization plateau formation depending on the anisotropy and presented the phase diagram of the mechanisms of 1/3 plateau.
