Interaction effects on electronic Floquet spectra: Excitonic effects
Abstract
Floquet engineering of electronic states by light is a central topic in modern experiments. However, the impact of many-body interactions on the single-electron properties remains unclear in this non-equilibrium situation. We propose that interaction effects could be reasonably understood by performing perturbative expansion in both the pump field and the electron-electron interaction when computing physical quantities. As an example, we apply this approach to semiconductors and show analytically that excitonic effects, i.e., effects of electron-hole interaction, lead to dramatic corrections to the single-electron Floquet spectra even when the excitons are only virtually excited by the pump light. We compute these effects in phosphorene and monolayer MoS for time- and angle-resolved photoemission spectroscopy and ultrafast optical experiments.
Cite
@article{arxiv.2505.07428,
title = {Interaction effects on electronic Floquet spectra: Excitonic effects},
author = {Teng Xiao and Tsan Huang and Changhua Bao and Zhiyuan Sun},
journal= {arXiv preprint arXiv:2505.07428},
year = {2025}
}