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

TL;DR

This paper provides an exact solution for the nonequilibrium behavior of a simple charge-density-wave insulator under a strong electric field, revealing the formation of Bloch oscillations and their impact on the density of states.

Contribution

It offers the first exact analytical solution for the nonequilibrium response of a charge-density-wave insulator in a strong electric field.

Findings

Observation of driven Bloch oscillations in the model

Modification of the density of states due to current

Insights into nonequilibrium dynamics of charge-density-wave systems

Abstract

Charge-density-wave systems have a static modulation of the electronic charge at low temperatures when they enter an ordered state. While they have been studied for decades in equilibrium, it is only recently that they have been examined in nonequilibrium with time-resolved studies. Here, we present the exact solution for the nonequilibrium response of electrons (in the simplest model for a charge density wave) when the system is placed under a strong DC electric field. This allows us to examine the formation of driven Bloch oscillations and how the presence of a current modifies the nonequilibrium density of states.