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Dimerizations in spin-S antiferromagnetic chains with three-spin interaction

Wang, Zheng-Yuan
Nakamura, Masaaki
Komakura, Ryo
Published in Physical Review. B, Condensed Matter. 2013, vol. 88, no. 22, p. 224419
Abstract We discuss spin-S antiferromagnetic Heisenberg chains with three-spin interactions, next-nearest-neighbor interactions, and bond alternation. First, we prove rigorously that there exist parameter regions of the exact dimerized ground state in this system. This is a generalization of the Majumdar-Ghosh model to arbitrary S. Next, we discuss the ground-state phase diagram of the models by introducing several effective field theories and the universality classes of the transitions are described by the level-2S SU(2) Wess-Zumino-Witten model and the Gaussian model. Finally, we determine the phase diagrams of S = 1 and S = 3/2 systems by using exact diagonalization and level spectroscopy.
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Research group Groupe Giamarchi
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WANG, Zheng-Yuan et al. Dimerizations in spin-S antiferromagnetic chains with three-spin interaction. In: Physical Review. B, Condensed Matter, 2013, vol. 88, n° 22, p. 224419. https://archive-ouverte.unige.ch/unige:87839

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Deposited on : 2016-09-28

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