Orthogonal Polynomial Representation of Imaginary-Time Green's Functions

Details Orthogonal Polynomial Representation of Imaginary-Time Green's Functions Orthogonal Polynomial Representation of Imaginary-Time Green's Functions

2011-04-16

arxiv.org/abs/1104.3215v3

Phys. Rev. B 84, 075145 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 11 figures

Scientific paper

10.1103/PhysRevB.84.075145

We study the expansion of single-particle and two-particle imaginary-time Matsubara Green's functions of quantum impurity models in the basis of Legendre orthogonal polynomials. We discuss various applications within the dynamical mean-field theory (DMFT) framework. The method provides a more compact representation of the Green's functions than standard Matsubara frequencies and therefore significantly reduces the memory-storage size of these quantities. Moreover, it can be used as an efficient noise filter for various physical quantities within the continuous-time quantum Monte Carlo impurity solvers recently developed for DMFT and its extensions. In particular, we show how to use it for the computation of energies in the context of realistic DMFT calculations in combination with the local density approximation to the density functional theory (LDA+DMFT) and for the calculation of lattice susceptibilities from the local irreducible vertex function.

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