论文标题
表征固体中异常的高谐波产生
Characterizing Anomalous High-Harmonic Generation in Solids
论文作者
论文摘要
由于非线性垂直电流类似于霍尔电流，因此在某些固体中会在某些固体中出现异常的高谐波产生（HHG）。在这里，我们从理论上表征了异常的HHG机制，通过开发用于强场激光 - 固定相互作用的AB-Initio方法，该方法允许对总电流进行严格的分解。我们确定了异常谐波产量的两个关键特征：激光波长的总体增加；并在某些强度或波长围绕围绕发射时间概况发生巨大变化的某些最小值或最小值。可以利用此类签名将异常的谐波与竞争的频带谐波相反，因此可以为实验识别和对纯异常谐波的时间域的控制铺平道路。
Anomalous high-harmonic generation (HHG) arises in certain solids when irradiated by an intense laser field, as the result of a nonlinear perpendicular current akin to a Hall current. Here, we theoretically characterize the anomalous HHG mechanism, via development of an ab-initio methodology for strong-field laser-solid interaction that allows a rigorous decomposition of the total current. We identify two key characteristics of the anomalous harmonic yields: an overall increase with laser wavelength; and pronounced minima at certain intensities or wavelengths around which the emission time profiles drastically change. Such signatures can be exploited to disentangle the anomalous harmonics from the competing interband harmonics, and thus pave way for the experimental identification and time-domain control of pure anomalous harmonics.
