The ground-state energy of gapped quantum chains with form-bounded short-range interactions is analytic in the coupling constant in a fixed disk independent of chain length, and the thermodynamic-limit energy per site is analytic under translation invariance.
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Lie-Schwinger block-diagonalization and gapped quantum chains: analyticity of the ground-state energy
The ground-state energy of gapped quantum chains with form-bounded short-range interactions is analytic in the coupling constant in a fixed disk independent of chain length, and the thermodynamic-limit energy per site is analytic under translation invariance.