Brillouin-zone integration scheme for many-body density of states: Tetrahedron method combined with cluster perturbation theory

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.

arXiv comment13 pages, 3 figures, to be published in Phys. Rev. B

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• Variational cluster approach to thermodynamic properties of interacting fermions at finite temperatures: A case study of the two-dimensional single-band Hubbard model at half filling
• Incommensurate spiral magnetic order on anisotropic triangular lattice: Dynamical mean field study in a spin-rotating frame
• Obstruction and Interference in Low Energy Models for Twisted Bilayer Graphene
• Maximum entropy analytic continuation of anomalous self-energies
• Twisting the Hubbard model into the Momentum-Mixing Hatsugai-Kohmoto Model