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arXiv 2106.08359cond-mat.stat-mechmath-phmath.MPquant-ph
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从形状因子展开研究XY自旋链的失平衡动力学

Out-of-equilibrium dynamics of the XY spin chain from form factor expansion

Etienne Granet, Henrik Dreyer, Fabian H. L. Essler

摘要:

考虑具有任意含时磁场和各向异性的XY自旋链。我们认为,高斯态的某个子类,称为相干包绕(CE)[1],为该模型中的非平衡物理提供了一个自然和统一的框架。我们发现,$all$关联函数的CE可以计算使用形状因子扩展和Fredholm行列式表示。特别地,我们给出了先前未知的序参量单点函数、动力学两点函数和等时三点函数在热力学极限下的精确的非平衡表达式.

英文摘要:

We consider the XY spin chain with arbitrary time-dependent magnetic field and anisotropy. We argue that a certain subclass of Gaussian states, called Coherent Ensemble (CE) following [1], provides a natural and unified framework for out-of-equilibrium physics in this model. We show that $all$ correlation functions in the CE can be computed using form factor expansion and expressed in terms of Fredholm determinants. In particular, we present exact out-of-equilibrium expressions in the thermodynamic limit for the previously unknown order parameter one-point function, dynamical two-point function and equal-time three-point function.

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