@inproceedings{oai:repo.qst.go.jp:00079641,
 author = {Okamoto, Kiyomi and Tonegawa, Takashi and Kaburagi, Makoto and Sakai, Toru and Sakai, Toru},
 book = {JPS Conference Proceedings},
 month = {Mar},
 note = {By using mainly numerical methods, we investigate the ground-state phase 
diagram (GSPD) of an S = 1 ferromagnetic–antiferromagnetic bond-
alternating chain with the XXZ and the on-site anisotropies. This system 
can be mapped onto an anisotropic spin-2 chain when the ferromagnetic 
interaction is much stronger than the antiferromagnetic interaction. 
Since there are many quantum parameters in this system, we numerically 
obtained the GSPD on the plane of the magnitude of the antiferromagnetic 
coupling versus its XXZ anisotropy, by use of the exact diagonalization, 
the level spectroscopy as well as the phenomenological renormalization 
group. The obtained GSPD consists of six phases. They are the XY1, the 
large-D (LD), the intermediate-D (ID), the Haldane (H), the spin-1 
singlet dimer (SD), and the Néel phases. Among them, the LD, the H, and 
the SD phases are the trivial phases, while the ID phase is the symmetry
-protected topological phase. The former three are smoothly connected 
without any quantum phase transitions. It is also emphasized that the ID 
phase appears in a wider region compared with the case of the GSPD of 
the anisotropic spin-2 chain with the XXZ and the on-site anisotropies.},
 pages = {011024-1--011024-6},
 title = {Ground-State Phase Diagram of an Anisotropic S = 1 Ferromagnetic– Antiferromagnetic Bond-Alternating Chain},
 volume = {30},
 year = {2020}
}