论文标题
频段反转附近的非线性时域光谱
Nonlinear Time Domain Spectroscopy Near a Band Inversion
论文作者
论文摘要
我们开发了一个由超快光脉冲驱动的Weyl半分化的非线性时域响应的理论。在驾驶场中的二次顺序下，我们发现频带反转过渡附近的响应包含一个连贯的振荡组件比例比例的磁场强度，并且可以通过化学电位选择的频率（从THZ到接近IR）进行调谐。我们通过计算诱导电流作为奇偶校模型破碎的Weyl半学模型的函数来说明效果，其中带有较大的浆果曲率在频段反转过渡附近促进了这种非线性响应。
We develop a theory for the nonlinear time domain response of a Weyl semimetal driven by an ultrafast optical pulse. At quadratic order in the driving field we find that the response near a band inversion transition contains a coherent oscillating component proportional field intensity and with a frequency that can be tuned over a wide range (from THz to the near IR) selected by the chemical potential. We illustrate the effect by calculating the induced current as a function of time for a model of a parity broken Weyl semimetal where large Berry curvature near the band inversion transition promotes this nonlinear response.
