论文标题
关于在固态高谐波中脱落的真实空间观点
A Real-Space Perspective on Dephasing in Solid-State High Harmonic Generation
论文作者
论文摘要
我们对晶体中的HHG进行了完全真实的空间观点。由于在存在强场的情况下在亚周期尺度上引起的瓦尼尔式定位，因此对强驱动固体是自然的。我们的方法使我们能够解决极短的开发时间的起源，这对于实验性HHG测量和在相互空间中通常进行的理论计算之间的一致性似乎是必不可少的。我们开发了一个物理上透明的真实空间dephasing模型，该模型将其速率与激光驱动的晶格中不同位点之间的距离联系起来。我们的方法在微观水平上导致结构良好的高谐波光谱，再现宏观传播的结果，并证明对超快脱位时间的需求源于在辐射性重组期间抑制大型电子孔分离的重组事件的需求。
We develop and demonstrate a fully real-space perspective on HHG in crystals. Due to Wannier-Stark localization induced on sub-cycle timescales in the presence of a strong field, real-space descriptions are natural for strongly driven solids. Our approach allows us to address the origin of the extremely short dephasing times, which appear necessary for agreement between experimental HHG measurements and theoretical calculations generally performed in reciprocal space. We develop a physically transparent model of real-space dephasing which relates its rate to the distance between different sites in a laser-driven lattice. Our approach leads to well-structured high harmonic spectra at the microscopic level, reproduces results of macroscopic propagation, and demonstrates that the requirement for ultrafast dephasing times stems from the need for suppressing recombination events with large electron-hole separations during radiative recombination.
