Electric-field-dependent energy structure of quasi-one-dimensional conductor o-TaS_3

TL;DR

This study investigates how electric fields influence the energy structure within the Peierls gap of the quasi-one-dimensional conductor o-TaS_3, revealing electric field effects on energy levels and their redistribution.

Contribution

It provides the first spectral analysis of the electric-field dependence of the Peierls gap energy structure in o-TaS_3, highlighting the role of collective states.

Findings

Energy levels inside the Peierls gap depend on temperature and electric field.

Electric fields of about 10 V/cm alter energy levels and peak intensities.

Participation of collective states influences the formation of energy levels.

Abstract

Energy structure of the Peierls gap in orthorhombic TaS$_3$ is examined by spectral study of photoconduction. The gap edge and energy levels inside the Peierls gap are observed. The amplitude of the energy levels is found to depend on both the temperature and the electric field. The electric field of the order of 10 V/cm affects the energy levels and leads to the redistribution of intensity between peaks. The small value of the electric field indicates participation of the collective state in formation of the energy levels inside the Peierls gap.