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arXiv 1503.00983cond-mat.str-elcond-mat.stat-mech
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安德森模型的电子动力学。多体方法

Electronic Dynamics of the Anderson Model. The Many-Body Approach

A. L. Kuzemsky

摘要:

本文综述了单杂质和多杂质Anderson模型的电子动力学。这些模型被广泛用于各种感兴趣的领域中的许多应用,例如表面物理学、金属表面上的化学吸附和吸附物反应理论、中间价系物理学、重费米子理论、量子点和其他纳米结构的物理学。虽然标准的治疗一般是基于微扰方法,我们的方法是基于非微扰技术的热力学格林函数。不可约格林函数法是本文的基本工具。这种不可约格林函数方法使人们能够以一种非常一般和自然的方式描述强关联电子系统的有阻尼准粒子谱,并在Dyson方程水平上以自洽的方式构造相应的动力学解,而不需要解耦格林函数的运动方程链。主要内容包括安德森模型的改进插值解。结果表明,插值近似,它同时再现弱耦合限制到第二阶的相互作用强度U和强耦合限制到第二阶的杂交V(因此也满足原子限制)可以制定自洽。该方法为系统地构造强关联电子系统的近似插值动力学解提供了一条新途径。

英文摘要:

A review of electronic dynamics of single-impurity and many-impurity Anderson models is contained in this report. Those models are used widely for many of the applications in diverse fields of interest, such as surface physics, theory of chemisorption and adsorbate reactions on metal surfaces, physics of intermediate valence systems, theory of heavy fermions, physics of quantum dots and other nanostructures. While standard treatments are generally based on perturbation methods, our approach is based on the non-perturbative technique for the thermodynamic Green functions. The method of the irreducible Green functions is used as the basic tool. This irreducible Green functions method allows one to describe the quasiparticle spectra with damping of the strongly correlated electron systems in a very general and natural way and to construct the relevant dynamical solution in a self-consistent way on the level of Dyson equation without decoupling the chain of the equations of motion for the Green functions. The subject matter includes the improved interpolating solution of the Anderson model. It was shown that an interpolating approximation, which simultaneously reproduces the weak-coupling limit up to second order in the interaction strength U and the strong-coupling limit up to second order in the hybridization V (and thus also fulfils the atomic limit) can be formulated self-consistently. This approach offers a new way for the systematic construction of approximate interpolation dynamical solutions of strongly correlated electron systems.

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