非平衡格林函数方法中的相关性
Correlations within the Non-Equilibrium Green's Function Method
摘要：
非平衡态格林函数（NGF）方法是研究量子多体系统演化的有力工具。不同类型的相关性可以系统地纳入形式主义。用Kadanoff-Baym方程描述了单粒子格林函数的时间演化。目前的工作首先集中在介绍无限核物质在一维的相关性，然后在有限系统中的神经生长因子的方法。从谐振子哈密顿量出发，通过同时引入平均场和关联，得到了具有基态特征的关联态.此外，使用冷却来改善绝热切换进行了探索。
英文摘要：
Non-equilibrium Green's Function (NGF) method is a powerful tool for studying the evolution of quantum many-body systems. Different types of correlations can be systematically incorporated within the formalism. The time evolution of the single-particle Green's functions is described in terms of the Kadanoff-Baym equations. The current work initially focuses on introducing the correlations within infinite nuclear matter in one dimension and then in a finite system in the NGF approach. Starting from the harmonic oscillator Hamiltonian, by switching on adiabatically the mean-field and correlations simultaneously, a correlated state with ground-state characteristics is arrived at within the NGF method. Furthermore the use of cooling to for improving the adiabatic switching is explored.
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