Super Bloch oscillations in the Peyrard-Bishop-Holstein model

TL;DR

This paper investigates the dynamics of polarons in the Peyrard-Bishop-Holstein model under combined DC and AC electric fields, revealing resonant and detuned oscillations and analyzing the resulting current spectra.

Contribution

It extends previous work by analyzing polaron behavior under mixed electric fields and characterizes the resulting oscillations and current spectra.

Findings

Polaron undergoes directed motion or coherent oscillations under combined fields.

Resonant and detuned AC fields produce distinct oscillation behaviors.

Electric current spectra reveal frequencies involved in polaron dynamics.

Abstract

Recently, polarons in the Peyrard-Bishop-Holstein model under DC electric fields were established to perform Bloch oscillations, provided the charge-lattice coupling is not large. In this work, we study this model when the charge is subjected to an applied field with both DC and AC components. Similarly to what happens in the rigid lattice, we find that the carrier undergoes a directed motion or coherent oscillations when the AC field is resonant or detuned with respect to the Bloch frequency, respectively. The electric density current and its Fourier spectrum are also studied to reveal the frequencies involved in the polaron dynamics.