Quasilocal conserved operators in isotropic Heisenberg spin 1/2 chain

Abstract

Composing higher auxiliary-spin transfer matrices and their derivatives, we construct a family of quasilocal conserved operators of isotropic Heisenberg spin 1/2 chain and rigorously establish their linear independence from the well-known set of local conserved charges.

5 + 6 pages in RevTex; v2: slightly revised version as accepted by PRL

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