Universality Classes of Spin Transport in One-Dimensional Isotropic Magnets: The Onset of Logarithmic Anomalies

Physical Review Letters
Jacopo De NardisEnej Ilievski

Abstract

We report a systematic study of finite-temperature spin transport in quantum and classical one-dimensional magnets with isotropic spin interactions, including both integrable and nonintegrable models. Employing a phenomenological framework based on a generalized Burgers' equation in a time-dependent stochastic environment, we identify four different universality classes of spin fluctuations. These comprise, aside from normal spin diffusion, three types of superdiffusive transport: the Kardar-Parisi-Zhang universality class and two distinct types of anomalous diffusion with multiplicative logarithmic corrections. Our predictions are supported by extensive numerical simulations on various examples of quantum and classical chains. Contrary to common belief, we demonstrate that even nonintegrable spin chains can display a diverging spin diffusion constant at finite temperatures.

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May 20, 2020·Physical Review. E·Guillaume BarraquandAlberto Rosso

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Citations

Jan 8, 2021·Physical Review Letters·Žiga KrajnikTomaž Prosen
Aug 17, 2021·Physical Review Letters·Jacopo De NardisBrayden Ware

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