Anomalous temperature dependence of polaron mobility in a nonlinear double-well potential: unbiased X-propagator approach

We develop an unbiased X-propagator method for calculating finite-temperature optical conductivity $σ(ω)$ and dc mobility $μ$ for arbitrary nonlinear electron-phonon interaction.

We develop an unbiased X-propagator method for calculating finite-temperature optical conductivity $σ(ω)$ and dc mobility $μ$ for arbitrary nonlinear electron-phonon interaction. We apply it to a polaron coupled to a double-well lattice potential, a minimal model for strongly…