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      Instability of subdiffusive spin dynamics in strongly disordered Hubbard chain

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          Abstract

          We study spin transport in a Hubbard chain with strong, random, on--site potential and with spin--dependent hopping integrals, \(t_{\sigma}\). For the the SU(2) symmetric case, \(t_{\uparrow} =t_{\downarrow}\), such model exhibits only partial many-body localization with localized charge and (delocalized) subdiffusive spin excitations. Here, we demonstrate that breaking the SU(2) symmetry by even weak spin--asymmetry, \(t_{\uparrow} \ne t_{\downarrow}\), localizes spins and restores full many-body localization. To this end we derive an effective spin model, where the spin subdiffusion is shown to be destroyed by arbitrarily weak \(t_{\uparrow} \ne t_{\downarrow}\). Instability of the spin subdiffusion originates from an interplay between random effective fields and singularly distributed random exchange interactions.

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          Most cited references 29

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          Localization of interacting fermions at high temperature

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            Observation of many-body localization of interacting fermions in a quasirandom optical lattice

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              Phenomenology of fully many-body-localized systems

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                Author and article information

                Journal
                09 March 2019
                1903.03770 10.1103/PhysRevB.99.121110

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                accepted as a Rapid Communication in Physical Review B
                cond-mat.str-el cond-mat.dis-nn

                Condensed matter, Theoretical physics

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