Kernel polynomial representation for imaginary-time Green’s functions in continuous-time quantum Monte Carlo impurity solver
Huang Li†,
       

Calculated Legendre and Chebyshev coefficients β|Gn| for imaginary-time Green’s functions of the single-band half-filled Hubbard model on the Bethe lattice within DMFT. The Coulomb interaction strength U is 4.0 and the inverse temperature β is 10. The coefficients in the pink region contribute very little to the resulting Green’s function.