Effect of electron-phonon interaction range on lattice polaron dynamics: A continuous-time quantum Monte Carlo study Paul E. Spencer J.H. Samson P.E. Kornilovitch A.S. Alexandrov 2134/1312 https://repository.lboro.ac.uk/articles/journal_contribution/Effect_of_electron-phonon_interaction_range_on_lattice_polaron_dynamics_A_continuous-time_quantum_Monte_Carlo_study/9409829 We present the numerically exact ground-state energy, effective mass, and isotope exponents of a one-dimensional lattice polaron, valid for any range of electron-phonon interaction, applying a continuous-time quantum Monte Carlo (QMC) technique in a wide range of coupling strength and adiabatic ratio. The QMC method is free from any systematic finite-size and finite-time-step errors. We compare our numerically exact results with analytical weak-coupling theory and with the strong-coupling 1∕λ expansion. We show that the exact results agree well with the canonical Fröhlich and Holstein-Lang-Firsov theories in the weak and strong coupling limits, respectively, for any range of interaction. We find a strong dependence of the polaron dynamics on the range of interaction. An increased range of interaction has a similar effect to an increased (less adiabatic) phonon frequency: specifically, a reduction in the effective mass. 2006-04-27 13:18:47 untagged Physical Sciences not elsewhere classified