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Effective models for Anderson impurity and Kondo problems from continuous unitary transformations

机译:连续unit变换对安德森杂质和近藤问题的有效模型

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摘要

The method of continuous unitary transformations (CUTs) is applied to the Anderson impurity and the Kondo model aiming at the systematic derivation of convergent effective models. If CUTs are applied in a conventional way, diverging differential equations occur. Similar to poor man's scaling, the energy scale, below which the couplings diverge, corresponds to the Kondo temperature T_K. We present a way to apply CUTs to the Kondo and to the Anderson impurity model so that no divergences occur but a converged effective low-energy model is derived with small finite parameters at arbitrarily small energies. The ground state corresponds to a bound singlet with a binding energy given by the Kondo temperature T_K.
机译:针对安德森杂质和近藤模型应用连续unit变换的方法,旨在对收敛有效模型进行系统推导。如果以常规方式应用CUT,则会出现发散的微分方程。类似于穷人的缩放比例,在其之下,联轴器发散的能量比例对应于近藤温度T_K。我们提出了一种将CUT应用于近藤和安德森杂质模型的方法,这样就不会出现发散,但是可以在任意小的能量下以小的有限参数导出收敛的有效低能量模型。基态对应于具有由近藤温度T_K给出的结合能的结合单线态。

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