论文标题
封闭式单层1T $'$ - wte $ _2 $
Second Harmonic Helicity and Faraday Rotation in Gated Single-Layer 1T$'$-WTe$_2$
论文作者
论文摘要
1T $'$ ephas of wte $ _2 $的单层为异国情调的物理特性提供了丰富的平台，例如非线性厅效应和高温量子旋转大厅运输。利用连续模型和示意法，我们计算了单层1T $'$ -WTE $ _2 $的第二个谐波电导率，由外部垂直电场和电子掺杂调制。在时间反向对称性的情况下，我们获得了第二个谐波信号的有限螺旋和法拉第旋转，以响应线性极化的入射光。第二个谐波信号的螺旋度可以通过改变偏置电位并作为非线性霍尔电流的光学指标高度控制。我们的研究激发了对二维材料的螺旋光谱法的未来实验研究。
Single-layer of 1T$'$ phase of WTe$_2$ provides a rich platform for exotic physical properties such as nonlinear Hall effect and high-temperature quantum spin hall transport. Utilizing a continuum model and diagrammatic method, we calculate the second harmonic conductivity of monolayer 1T$'$-WTe$_2$ modulated by an external vertical electric field and electron doping. We obtain a finite helicity and Faraday rotation for the second harmonic signal in response to linearly polarized incident light in the presence of time-reversal symmetry. The second harmonic signal's helicity is highly controllable by altering the bias potential and serves as an optical indicator of the nonlinear Hall current. Our study motivates future experimental investigation for the helicity spectroscopy of two dimensional materials.
