Identification of Gapless Phases by a Twisting Operator.
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DOI: 10.1103/29j7-ltfn
Abstract: We propose a general necessary condition for a spin chain with SO(3) spin-rotation symmetry to be gapped. Specifically, we prove that the ground state(s) of an SO(3)-symmetric gapped spin chain must be spin singlet(s), and… read more here.
Keywords: gapless phases; phases twisting; identification gapless; twisting operator ... See more keywords