Bilinear-biquadratic spin-1 model in the Haldane and dimerized phases
نویسندگان
چکیده
We study the low-lying spectrum of bilinear-biquadratic Heisenberg model in dimerized and Haldane phases using a tensor renormalization method. At critical point $\ensuremath{\theta}=\ensuremath{-}\ensuremath{\pi}/4$, finite-size predicted by Wess-Zumino-Witten (WZW) can only partly be confirmed. find singlet-singlet gap which does not fit into WZW systematics. The results obtained are compared to Bethe ansatz, exact diagonalization, density-matrix group calculations for specific parameters.
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ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.105.024424