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• W2408646080 abstract "A formalism for electronic-structure calculations is presented that is based on the functional renormalization group (FRG). The traditional FRG has been formulated for systems that exhibit a translational symmetry with an associated Fermi surface, which can provide the organization principle for the renormalization group (RG) procedure. We here advance an alternative formulation, where the RG-flow is organized in the energy-domain rather than in k-space. This has the advantage that it can also be applied to inhomogeneous matter lacking a band-structure, such as disordered metals or molecules. The energy-domain FRG ({epsilon}FRG) presented here accounts for Fermi-liquid corrections to quasi-particle energies and particle-hole excitations. It goes beyond the state of the art GW-BSE, because in {epsilon}FRG the Bethe-Salpeter equation (BSE) is solved in a self-consistent manner. An efficient implementation of the approach that has been tested against exact diagonalization calculations and calculations based on the density matrix renormalization group is presented. Similar to the conventional FRG, also the {epsilon}FRG is able to signalize the vicinity of an instability of the Fermi-liquid fixed point via runaway flow of the corresponding interaction vertex. Embarking upon this fact, in an application of {epsilon}FRG to the spinless disordered Hubbard model we calculate its phase-boundary in the plane spanned by the interaction and disorder strength. Finally, an extension of the approach to finite temperatures and spin S = 1/2 is also given." @default.
• W2408646080 created "2016-06-24" @default.
• W2408646080 creator A5031305744 @default.
• W2408646080 creator A5052058613 @default.
• W2408646080 date "2016-10-03" @default.
• W2408646080 modified "2023-10-15" @default.
• W2408646080 title "Functional renormalization group approach to electronic structure calculations for systems without translational symmetry" @default.
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• W2408646080 doi "https://doi.org/10.1103/physrevb.94.155102" @default.
• W2408646080 hasPublicationYear "2016" @default.
• W2408646080 type Work @default.
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