Yang Wang, Yu Liu, Jianing Zhang, Xiulan Liu, Pengzuo Jiang, Jingying Xiao, Linfeng Zhang, Hong Yang, Liang-You Peng, Yunquan Liu, Qihuang Gong and Chengyin Wu*,
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High-Order Harmonic Generation in Photoexcited Three-Dimensional Dirac Semimetals
High-order harmonic generation (HHG) in condensed matter is highly important for potential applications in various fields, such as materials characterization, all-optical switches, and coherent light source generation. Linking HHG to the properties or dynamic processes of materials is essential for realizing these applications. Here, a bridge has been built between HHG and the transient properties of materials through the engineering of interband polarization in a photoexcited three-dimensional Dirac semimetal (3D-DSM). It has been found that HHG can be efficiently manipulated by the electronic relaxation dynamics of 3D-DSM on an ultrafast time scale of several hundred femtoseconds. Furthermore, time-resolved HHG (tr-HHG) has been demonstrated to be a powerful spectroscopy method for tracking electron relaxation dynamics, enabling the identification of electron thermalization and electron–phonon coupling processes and the quantitative extraction of electron–phonon coupling strength. This demonstration provides insights into the active control of HHG and measurements of the electron dynamics.
期刊介绍:
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.