1 T $'$的二次谐波螺旋度和法拉第旋转
Second Harmonic Helicity and Faraday Rotation in Gated Single-Layer 1T$'$-WTe$_2$
摘要：
WTe $_2$的单层1 T $'$相为非线性霍尔效应和高温量子自旋霍尔输运等奇异物理性质提供了丰富的平台。利用连续介质模型和图解法计算了单层1 T $'$ $_2$在外加垂直电场和电子掺杂调制下的二次谐波电导率。我们得到了有限的螺旋度和法拉第旋转的二次谐波信号响应线偏振入射光的存在下的时间反演对称。二次谐波信号的螺旋度是高度可控的，通过改变偏置电位，并作为非线性霍尔电流的光学指标。我们的研究激励未来的实验研究的螺旋度光谱的二维材料。
英文摘要：
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.
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