Energy-level ordering for frustrated spin ladder models
Elementary Particles and Fields Theory
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- Hakobyan, T. Phys. Atom. Nuclei (2010) 73: 339. doi:10.1134/S1063778810020213
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The Lieb—Mattis theorem about ordering of energy levels is generalized to frustrated antiferromagnetic spin-1/2 ladder model with diagonal and four-spin interaction.
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