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arXiv 1807.02414cond-mat.stat-mechcond-mat.quant-gashep-thmath-phmath.MP
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可积系统中的流体动力学扩散

Hydrodynamic Diffusion in Integrable Systems

Jacopo De Nardis, Denis Bernard, Benjamin Doyon

摘要:

我们表明,流体动力学扩散一般存在于多体相互作用的可积模型。我们扩展了最近开发的广义流体动力学(GHD),包括Navier-Stokes型的正熵产生和扩散松弛机制。这些项为可积系统的大尺度非平衡动力学提供了对欧拉尺度GHD的次主导扩散修正,并且是由于准粒子间的两体散射而产生的。我们给出了扩散系数的精确表达式。我们的结果适用于一大类可积模型,包括量子和经典,伽利略和相对论场论,链和气体在一维,如Lieb-Liniger模型描述冷原子气体和海森堡量子自旋链。我们提供的海森堡自旋链中的数值评估,无论是自旋扩散常数,并在熔化过程中的一个小的域壁的自旋扩散效应,找到良好的协议与tDMRG数值模拟。

英文摘要:

We show that hydrodynamic diffusion is generically present in many-body interacting integrable models. We extend the recently developed generalised hydrodynamic (GHD) to include terms of Navier-Stokes type which lead to positive entropy production and diffusive relaxation mechanisms. These terms provide the subleading diffusive corrections to Euler-scale GHD for the large-scale non-equilibrium dynamics of integrable systems, and arise due to two-body scatterings among quasiparticles. We give exact expressions for the diffusion coefficients. Our results apply to a large class of integrable models, including quantum and classical, Galilean and relativistic field theories, chains and gases in one dimension, such as the Lieb-Liniger model describing cold atom gases and the Heisenberg quantum spin chain. We provide numerical evaluations in the Heisenberg spin chain, both for the spin diffusion constant, and for the diffusive effects during the melting of a small domain wall of spins, finding excellent agreement with tDMRG numerical simulations.

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