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• W2026742246 abstract "We investigate the possibility to assist the numerically ill-posed calculation of spectral properties of interacting quantum systems in thermal equilibrium by extending the imaginary-time simulation to a finite Schwinger-Keldysh contour. The effect of this extension is tested within the standard maximum entropy approach to analytic continuation. We find that the inclusion of real-time data improves the resolution of structures at high energy, while the imaginary-time data are needed to correctly reproduce low-frequency features such as quasiparticle peaks. As a nonequilibrium application, we consider the calculation of time-dependent spectral functions from retarded Green function data on a finite time interval, and compare the maximum entropy approach to direct Fourier transformation and a method based on Padé approximants." @default.
• W2026742246 created "2016-06-24" @default.
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• W2026742246 date "2013-02-21" @default.
• W2026742246 modified "2023-09-27" @default.
• W2026742246 title "Extracting spectral properties from Keldysh Green functions" @default.
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• W2026742246 doi "https://doi.org/10.1103/physreve.87.023305" @default.
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