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Photoinduced topological phase transition and optical conductivity of black phosphorene

机译：黑色磷光体的光诱导拓扑相变和光导率

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摘要

We theoretically study the photoinduced topological phase transition of black phosphorene induced by laser light with moderate intensity, which can satisfy the experimentally realistic requirement to preserve the quality of the sample. By deriving the effective Floquet Hamiltonian in terms of pseudospin S = 1/2 degrees of freedom, we calculate the Chern number and the optical conductivity of the system with varying laser frequency Ω. As one can expect from the photon-assisted transport, the longitudinal optical conductivity has a threshold frequency atΩ= Δ/h, with A being the band gap of black phosphorene. Unlike the longitudinal optical conductivity, the optical Hall conductivity sharply increases when hΩ goes beyond one-half of the band gap Δ/2. We also show that the Chern number changes from trivial to nontrivial upon increasing frequency Ω beyond hΩ = Δ/2.
机译：我们从理论上研究了中等强度的激光诱导的黑色phosphor的光诱导拓扑相变，可以满足实验现实要求，以保持样品的质量。通过推导以伪自旋S = 1/2自由度表示的有效Floquet哈密顿量，我们可以计算出Chern数和随激光频率Ω变化的系统的光导率。可以从光子辅助传输中预期到，纵向光导率的阈值频率为Ω=Δ/ h，A为黑色磷的带隙。与纵向光导率不同，当hΩ超过带隙Δ/ 2的一半时，光霍尔电导率急剧增加。我们还表明，当频率Ω超过hΩ=Δ/ 2时，切恩数从平凡变为平凡。

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