Continuous-time quantum Monte Carlo approach for impurity Anderson models with phonon-assisted hybridizations

摘要

We develop a continuous-time quantum Monte Carlo method based on a strong-coupling expansion for Anderson impurity models with phonon-assisted hybridizations for arbitrary number of phonon modes. As a benchmark, we investigate the two-channel Anderson model with a single phonon, and numerically demonstrate that an SO(5) susceptibility composed of localized-electron charge and phonon-parity operators diverges logarithmically at non- Fermi liquid critical points in the model, which verifies the predictions by the boundary conformal field theory [K. Hattori: Phys. Rev. B 85 (2012) 214411].