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• W2924229723 abstract "We propose a systematic approach to the non-equilibrium dynamics of strongly interacting many-body quantum systems, building upon the standard perturbative expansion in the Coulomb interaction. High order series are derived from the Keldysh version of determinantal diagrammatic Quantum Monte Carlo, and the reconstruction beyond the weak coupling regime of physical quantities is obtained by considering them as analytic functions of a complex-valued interaction $U$. Our advances rely on two crucial ingredients: i) a conformal change of variable, based on the approximate location of the singularities of these functions in the complex $U$-plane; ii) a Bayesian inference technique, that takes into account additional known non-perturbative relations, in order to control the amplification of noise occurring at large $U$. This general methodology is applied to the strongly correlated Anderson quantum impurity model, and is thoroughly tested both in- and out-of-equilibrium. In the situation of a finite voltage bias, our method is able to extend previous studies, by bridging with the regime of unitary conductance, and by dealing with energy offsets from particle-hole symmetry. We also confirm the existence of a voltage splitting of the impurity density of states, and find that it is tied to a non-trivial behavior of the non-equilibrium distribution function. Beyond impurity problems, our approach could be directly applied to Hubbard-like models, as well as other types of expansions." @default.
• W2924229723 created "2019-04-01" @default.
• W2924229723 creator A5001206220 @default.
• W2924229723 creator A5026455979 @default.
• W2924229723 creator A5053883925 @default.
• W2924229723 creator A5072528719 @default.
• W2924229723 date "2019-10-08" @default.
• W2924229723 modified "2023-10-16" @default.
• W2924229723 title "Reconstructing Nonequilibrium Regimes of Quantum Many-Body Systems from the Analytical Structure of Perturbative Expansions" @default.
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• W2924229723 doi "https://doi.org/10.1103/physrevx.9.041008" @default.
• W2924229723 hasPublicationYear "2019" @default.
• W2924229723 type Work @default.
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• W2924229723 citedByCount "34" @default.

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