Exact solution for Bloch oscillations of a simple charge-density-wave insulator

摘要

Charge-density-wave systems have a static modulation of the electronic chargeat low temperatures when they enter an ordered state. While they have beenstudied for decades in equilibrium, it is only recently that they have beenexamined in nonequilibrium with time-resolved studies. Here, we present theexact solution for the nonequilibrium response of electrons (in the simplestmodel for a charge density wave) when the system is placed under a strong DCelectric field. This allows us to examine the formation of driven Blochoscillations and how the presence of a current modifies the nonequilibriumdensity of states.