Transport Dynamics of a Large Acoustic Polaron in One Dimension

The transport dynamics of a large polaron has been studied in a one-dimensional system whose underlying vibrational spectrum is acoustic in character. Such a polaron moves as a heavy quasiparticle with transport relaxation time, $\tau$, determined mainly by collisions with thermally ambient phonons. Concrete results show that $\tau$ decreases monotonically with increasing temperature, in sharp contrast to the previously treated problem of a large polaron in a one-dimensional Einstein lattice.