Orientation-dependent transition rule in high-order harmonic generation from solids

摘要

We study the role of the transition rule in high-order harmonic generation from solids driven by linearly polarized laser fields. The orientation-dependent transition dipoles can regulate the emergence of the multiplateau structure. In the multiplateau zone, however, different from the mechanisms of step-by-step excitation reported previously, we find that the emission time and orientation-dependent yields exhibit synchronization and more fine patterns, respectively. In addition, the orientation-dependent yields and their fine patterns can be attributed to the collective contribution of the transition rule and quantum-path interference. Therefore, to better understand the constructive and destructive patterns in the orientation-dependent yields, we propose a scheme of intercycle interference, which can further be utilized as a tool to image the structure of the solids and provide an avenue to optimize the electron dynamics in solids for the production of attosecond pulses in a compact setup.