Time-periodic light field can dress the electronic states and lead to light-induced emergent properties in quantum materials. While below-gap pumping is regarded favorable for Floquet engineering, so far direct experimental evidence of momentum-resolved band renormalization still remains missing. Here, we report experimental evidence of light-induced band renormalization in black phosphorus by pumping at photon energy of 160 meV which is far below the band gap, and the distinction between below-gap pumping and near-resonance pumping is revealed. Our work demonstrates light-induced band engineering upon below-gap pumping, and provides insights for extending Floquet engineering to more quantum materials.
@article{arxiv.2309.11339,
title = {Floquet engineering of black phosphorus upon below-gap pumping},
author = {Shaohua Zhou and Changhua Bao and Benshu Fan and Fei Wang and Haoyuan Zhong and Hongyun Zhang and Peizhe Tang and Wenhui Duan and Shuyun Zhou},
journal= {arXiv preprint arXiv:2309.11339},
year = {2023}
}