Floquet engineering of black phosphorus upon below-gap pumping

TL;DR

This study provides experimental evidence of light-induced band renormalization in black phosphorus using below-gap pumping, revealing distinctions from near-resonance pumping and advancing Floquet engineering in quantum materials.

Contribution

First experimental demonstration of momentum-resolved band renormalization in black phosphorus with below-gap light pumping, expanding Floquet engineering applications.

Findings

Light-induced band renormalization observed in black phosphorus.

Distinction between below-gap and near-resonance pumping effects.

Insights into extending Floquet engineering to other quantum materials.

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 work demonstrates light-induced band engineering upon below-gap pumping, and provides insights for extending Floquet engineering to more quantum materials.