Abstract
A new method is introduced for analytically continuing imaginary-time data from quantum Monte Carlo calculations to the real-frequency axis. The method is based on a least-squares fitting procedure with constraints of positivity and smoothness on the real-frequency quantities. Results are shown for the single-particle spectral-weight function and density of states for the half-filled two-dimensional Hubbard model.
- Received 5 June 1989
DOI:https://doi.org/10.1103/PhysRevLett.63.1523
©1989 American Physical Society