Spectral Analysis of Bloch-Like Oscillations in Conjugated Polymers

作者：Sutao Sun · 发表于：ACS Omega · 年份：2023 · DOI：10.1021/acsomega.3c05078 · 被引用次数：4 · 研究领域：Mechanical and Optical Resonators、Solid-state spectroscopy and crystallography、Photorefractive and Nonlinear Optics

We present a spectrum investigation of the behavior of dissociated polarons under high electric fields in conjugated polymers. The study employs the Su-Schrieffer-Heeger model along with nonadiabatic molecular dynamics and frequency-domain analysis methods to analyze the Bloch-like oscillations. It is found that the fundamental frequencies of the current density agree well with the theoretical Bloch frequencies of the perfect crystals. The electron-phonon coupling is a key factor in inducing the deviation between the Bloch-like oscillation behavior in conjugated polymers and that in perfect superlattices. Moreover, the increase in lattice thermal fluctuation is not conducive to the maintenance of Bloch-like oscillation behavior in conjugated polymers.