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- W2312116502 abstract "By combining the tetrahedron method with the cluster perturbation theory (CPT), we present an accurate method to numerically calculate the density of states of interacting fermions without introducing the Lorentzian broadening parameter $eta$ or the numerical extrapolation of $eta to 0$. The method is conceptually based on the notion of the effective single-particle Hamiltonian which can be subtracted in the Lehmann representation of the single-particle Green's function within the CPT. Indeed, we show the general correspondence between the self-energy and the effective single-particle Hamiltonian which describes exactly the single-particle excitation energies of interacting fermions. The detailed formalism is provided for two-dimensional multi-orbital systems and a benchmark calculation is performed for the two-dimensional single-band Hubbard model. The method can be adapted straightforwardly to symmetry broken states, three-dimensional systems, and finite-temperature calculations." @default.
- W2312116502 created "2016-06-24" @default.
- W2312116502 creator A5048160827 @default.
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- W2312116502 date "2016-06-07" @default.
- W2312116502 modified "2023-09-26" @default.
- W2312116502 title "Brillouin-zone integration scheme for many-body density of states: Tetrahedron method combined with cluster perturbation theory" @default.
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- W2312116502 doi "https://doi.org/10.1103/physrevb.93.245115" @default.
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