标题： 光诱导的少层黑磷中门控可调的弗洛凯间隙直流霍尔电流 显示英文标题

标题： Photoinduced DC Hall current in few-layer black phosphorus with a gate-tunable Floquet gap

摘要： 我们理论探讨了在时间周期驱动下少层黑磷（fBP）中的弗洛凯工程。 受圆偏振光在狄拉克节点处诱导非平凡拓扑态的能力的启发，我们研究了fBP狄拉克半金属相中的光致直流霍尔效应的出现。 从低能连续模型出发，我们推导出有效的弗洛凯哈密顿量，并解析计算了贝里曲率，证明了拓扑能隙的打开。 我们还进行了包含自洽哈特里方法的格点模型计算，以计算垂直电场下的弗洛凯能带结构和直流霍尔电导率。 我们的结果表明，fBP中的直流霍尔电流可以通过周期性驱动场和静电栅极有效调节。 显示英文摘要

摘要： We theoretically explore Floquet engineering in few-layer black phosphorus (fBP) under time-periodic driving. Motivated by the ability of circularly polarized light to induce nontrivial topological states at Dirac nodes, we investigate the emergence of a photoinduced DC Hall effect in the Dirac semimetal phase of fBP. Starting from a low-energy continuum model, we derive the effective Floquet Hamiltonian and analytically calculate the Berry curvature, demonstrating the opening of a topological gap. We also perform lattice-model calculations incorporating a self-consistent Hartree method to compute Floquet band structures and DC Hall conductivity under a perpendicular electric field. Our results reveal that the DC Hall current in fBP can be effectively tuned via a periodic driving field and electrostatic gating.