Quasilocal conservation laws from semicyclic irreducible representations of Uq(sl2)Uq(sl2) in XXZ spin-1/2 chains

We construct quasilocal conserved charges in the gapless (|Δ|≤1|Δ|≤1) regime of the Heisenberg XXZ   spin-1/2 chain, using semicyclic irreducible representations of Uq(sl2)Uq(sl2). These representations are characterized by a periodic action of ladder operators, which act as generators of the aforementioned algebra. Unlike previously constructed conserved charges, the new ones do not preserve magnetization, i.e. they do not possess the U(1)U(1) symmetry of the Hamiltonian. The possibility of application in relaxation dynamics resulting from U(1)U(1)-breaking quantum quenches is discussed.