期刊
PHYSICAL REVIEW B
卷 83, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.020407
关键词
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资金
- DARPA
- Knut and Alice Wallenberg Foundation
In a recent experiment on CoNb2O6, R. Coldea et al. [Science 83, 177 (2010)] found experimental evidence of the exceptional Lie algebra E-8. The emergence of this symmetry was theoretically predicted long ago for the transverse quantum Ising chain in the presence of a weak longitudinal field. We consider an accurate microscopic model of CoNb2O6 incorporating additional couplings and calculate numerically the dynamical structure function using a recently developed matrix-product-state method. The excitation spectra show bound states characteristic of the weakly broken E-8 symmetry. We compare the observed bound-state signatures in this model to those found in the transverse Ising chain in a longitudinal field and to experimental data.
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