Diffusive high-temperature transport in the one-dimensional Hubbard model

Abstract

We consider charge and spin transport in the one-dimensional Hubbard model at infinite temperature, half-filling and zero magnetization. Implementing matrix-product-operator simulations of the non-equilibrium steady states of boundary-driven open Hubbard chains for up to 100 sites we find clear evidence of diffusive transport for any (non-zero and finite) value of the interaction U.

6 pages RevTeX + 8 eps figures; revised and extended version

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