Floquet Engineering of Black Phosphorus upon Below-Gap Pumping
Shaohua Zhou, Changhua Bao, Benshu Fan, Fei Wang, Haoyuan Zhong, Hong‐Yun Zhang, Peizhe Tang, Wenhui Duan, Shuyun Zhou
Abstract
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 Letter demonstrates light-induced band engineering upon below-gap pumping, and provides insights for extending Floquet engineering to more quantum materials.