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arXiv 1207.3548cond-mat.str-el
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非线性Luttinger液体的长时间关联

Long time correlations of nonlinear Luttinger liquids

Rodrigo G. Pereira

摘要:

综述了Luttinger液体理论在描述具有非线性色散关系的临界一维系统的实时平衡动力学方面的局限性。在揭示了微扰理论在带曲率效应中的奇异性,从而打破了Tomonaga-Luttinger模型的Lorentz不变性之后,讨论了关联函数长时间行为中高频振荡的起源。由于晶格模型中的umklapp散射,密度-密度相关中的扩散效应对相关性在有限温度下指数衰减的概念提出了挑战。

英文摘要:

An overview is given of the limitations of Luttinger liquid theory in describing the real time equilibrium dynamics of critical one-dimensional systems with nonlinear dispersion relation. After exposing the singularities of perturbation theory in band curvature effects that break the Lorentz invariance of the Tomonaga-Luttinger model, the origin of high frequency oscillations in the long time behaviour of correlation functions is discussed. The notion that correlations decay exponentially at finite temperature is challenged by the effects of diffusion in the density-density correlation due to umklapp scattering in lattice models.

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