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We study the low-lying spectrum of the bilinear-biquadratic Heisenberg model in the dimerized and Haldane phases using a tensor renormalization method. At the critical point θ = −π/4 the finitesize… Click to show full abstract
We study the low-lying spectrum of the bilinear-biquadratic Heisenberg model in the dimerized and Haldane phases using a tensor renormalization method. At the critical point θ = −π/4 the finitesize spectrum predicted by the Wess-Zumino-Witten (WZW) model can only partly be confirmed. We find a singlet-singlet gap which does not fit into the WZW systematics. The results obtained are compared to Bethe Ansatz, exact diagonalization, and DMRG calculations for specific parameters.
Keywords:
model haldane;
model;
bilinear biquadratic;
biquadratic spin;
spin model
Journal Title: Physical Review B
Year Published: 2022
Link to full text (if available)
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Journal Title: Physical Review B
Year Published: 2022
Link to full text (if available)
Share on Social Media: Sign Up to like & get
recommendations!