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• W2791617570 abstract "Two-particle Green's functions and the vertex functions play a critical role in theoretical frameworks for describing strongly correlated electron systems. However, numerical calculations at the two-particle level often suffer from large computation time and massive memory consumption. We derive a general expansion formula for the two-particle Green's functions in terms of an overcomplete representation based on the recently proposed ``intermediate representation'' basis. The expansion formula is obtained by decomposing the spectral representation of the two-particle Green's function. We demonstrate that the expansion coefficients decay exponentially, while all high-frequency and long-tail structures in the Matsubara-frequency domain are retained. This representation therefore enables efficient treatment of two-particle quantities and opens a route to the application of modern many-body theories to realistic strongly correlated electron systems." @default.
• W2791617570 created "2018-03-29" @default.
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• W2791617570 date "2018-05-09" @default.
• W2791617570 modified "2023-10-15" @default.
• W2791617570 title "Overcomplete compact representation of two-particle Green's functions" @default.
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• W2791617570 doi "https://doi.org/10.1103/physrevb.97.205111" @default.
• W2791617570 hasPublicationYear "2018" @default.
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