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• W2067849968 abstract "The development of numerical methods capable of simulating realistic materials with strongly correlated electrons, with controllable errors, is a central challenge in quantum many-body physics. Here we describe a framework for a general multiscale method based on embedding a self-energy of a strongly correlated subsystem into a self-energy generated by a method able to treat large weakly correlated systems approximately. As an example, we present the embedding of an exact diagonalization self-energy into a self-energy generated from self-consistent second-order perturbation theory. Using a quantum impurity model, generated from a cluster dynamical mean field approximation to the two-dimensional Hubbard model, as a benchmark, we illustrate that our method allows us to obtain accurate results at a fraction of the cost of typical Monte Carlo calculations. We test the method in multiple regimes of interaction strengths and dopings of the model. The general embedding framework we present avoids difficulties such as double counting corrections, frequency-dependent interactions, or vertex functions. As it is solely formulated at the level of the single-particle Green's function, it provides a promising route for the simulation of realistic materials that are currently difficult to study with other methods." @default.
• W2067849968 created "2016-06-24" @default.
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• W2067849968 date "2015-03-23" @default.
• W2067849968 modified "2023-10-17" @default.
• W2067849968 title "Systematically improvable multiscale solver for correlated electron systems" @default.
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• W2067849968 doi "https://doi.org/10.1103/physrevb.91.121111" @default.
• W2067849968 hasPublicationYear "2015" @default.
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