Orientation dependence of temporal and spectral properties of high-order harmonics in solids
Orientation dependence of temporal and spectral properties of high-order harmonics in solids
复制标题
DOI：
10.1103/physreva.96.063412
复制
发表时间：
2017-12
影响因子：
2.9
通讯作者：
Mengxi Wu;Y. You;S. Ghimire;D. Reis;D. Browne;K. Schafer;M. Gaarde
中科院分区：
文献类型：
--
作者：
Mengxi Wu;Y. You;S. Ghimire;D. Reis;D. Browne;K. Schafer;M. Gaarde
我们研究晶体对称性与固体中高次谐波的时间和光谱性质之间的联系。我们计算的取向依赖的谐波谱驱动的强烈的，线偏振的红外激光场，使用动量空间描述的产生过程中的强场驱动的电子动力学的能带结构。我们表明，谐波辐射的光谱产率和子周期时间分布的取向依赖性可以理解的耦合强度和相对曲率的价带和低洼导带。特别是，我们表明，在某些系统中，这引起了四分之一的光学周期的快速移位的谐波在二次高原的时间作为晶体相对于激光偏振旋转。我们讨论了最近的实验结果在MgO [Y. S.您等，Nat.Phys.13，345（2017）.]并表明，所观察到的最高谐波的取向依赖性的变化可以解释在动量空间图片的几个不同的导带的贡献。
We investigate the connection between crystal symmetry and temporal and spectral properties of high-order harmonics in solids. We calculate the orientation-dependent harmonic spectrum driven by an intense, linearly polarized infrared laser field, using a momentum-space description of the generation process in terms of strong-field-driven electron dynamics on the band structure. We show that the orientation dependence of both the spectral yield and the subcycle time profile of the harmonic radiation can be understood in terms of the coupling strengths and relative curvatures of the valence band and the low-lying conduction bands. In particular, we show that in some systems this gives rise to a rapid shift of a quarter optical cycle in the timing of harmonics in the secondary plateau as the crystal is rotated relative to the laser polarization. We address recent experimental results in MgO [Y. S. You et al., Nat. Phys. 13, 345 (2017).] and show that the observed change in orientation dependence for the highest harmonics can be interpreted in the momentum space picture in terms of the contributions of several different conduction bands.