New paper: Quantum phase transitions driven by rhombic-type...

Yu-Chin Tzeng, Hiroaki Onishi, Tsuyoshi Okubo, and Ying-Jer Kao,
Quantum phase transitions driven by rhombic-type single-ion anisotropy in the S=1 Haldane chain, Phys. Rev. B 96, 060404(R) (2017).