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Many-body mobility edge due to symmetry-constrained dynamics and strong interactions

We provide numerical evidence combined with an analytical understanding of the many-body mobility edge for the strongly anisotropic spin-1/2 XXZ model in a random magnetic field. The system dynamics can be understood in terms of symmetry-constrained excitations about parent states with ferromagnetic and anti-ferromagnetic short range order. These two regimes yield vastly different dynamics producing an observable, tunable many-body mobility edge. We compute a set of diagnostic quantities that verify the presence of the mobility edge and discuss how weakly correlated disorder can tune the mobility edge further.

preprint2015arXivOpen access
Ian Mondragon-ShemArijeet PalTaylor L. HughesChris R. Laumann
cond-mat.stat-mechcond-mat.str-elcond-mat.dis-nn
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Ian Mondragon-ShemArijeet PalTaylor L. HughesChris R. Laumann

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