Computing Local Multipoint Correlators Using the Numerical Renormalization Group

doi:10.1103/PhysRevX.11.041007

2021-10-11

Seung‐Sup B. Lee *

Fabian B. Kugler

Jan von Delft

DOI：10.1103/PhysRevX.11.041007

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摘要

En 中文

Local three- and four-point correlators yield important insight into strongly correlated systems and have many applications. However, the nonperturbative, accurate computation of multipoint correlators is challenging, particularly in the real-frequency domain for systems at low temperatures. In the accompanying paper, we introduce generalized spectral representations for multipoint correlators. Here, we develop a numerical renormalization group approach, capable of efficiently evaluating these spectral representations, to compute local three- and four-point correlators of quantum impurity models. The key objects in our scheme are partial spectral functions, encoding the system's dynamical information. Their computation via numerical renormalization group allows us to simultaneously resolve various multiparticle excitations down to the lowest energies. By subsequently convolving the partial spectral functions with appropriate kernels, we obtain multipoint correlators in the imaginary-frequency Matsubara, the realfrequency zero-temperature, and the real-frequency Keldysh formalisms. We present exemplary results for the connected four-point correlators of the Anderson impurity model, and for resonant inelastic x-ray scattering spectra of related impurity models. Our method can treat temperatures and frequenciesimaginary or real-of all magnitudes, from large to arbitrarily small ones.

Keyword:

Computational Physics

Condensed Matter Physics

Strongly Correlated Materials

期刊

Physical Review X

IF:

15.7

论文数:

2.7K

被引数:

3.4W

机构

University of Munich

学者数:

5.7W

论文数: 4.2W

被引数: 68

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