Spin transport in long-range interacting one-dimensional chain

Benedikt Kloss; Yevgeny Bar Lev

doi:10.1103/physreva.99.032114

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arXiv · 1804.05841

Spin transport in long-range interacting one-dimensional chain

Benedikt Kloss·Yevgeny Bar Lev

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Abstract

We numerically study spin transport and nonequilibrium spin-density profiles in a clean one-dimensional spin-chain with long-range interactions, decaying as a power-law,$r^{-α}$ with distance. We find two distinct regimes of transport: for $α<1/2$, spin excitations relax instantaneously in the thermodynamic limit, and for $α>1/2$, spin transport combines both diffusive and superdiffusive features. We show that while for $α>3/2$ the spin diffusion coefficient is finite, transport in the system is never strictly diffusive, contrary to corresponding classical systems.

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Benedikt Kloss, Yevgeny Bar Lev. 2018-04-16. Spin transport in long-range interacting one-dimensional chain. https://doi.org/10.1103/physreva.99.032114

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