研究目的
To demonstrate that the crystal harmonic spectra from an ultrashort midinfrared laser pulse exhibit the Cooper minimum characteristic and to explore its implications for retrieving band information of solid materials.
研究成果
The study demonstrates that harmonic spectra of the MgO crystal in an ultrashort laser pulse exhibit the Cooper minimum structure, which is closely related to the valley of the TDM. This finding suggests a new method for retrieving the band information of solid materials using HHG.
研究不足
The study is theoretical and relies on simulations based on the SBEs and first-principles calculations. Experimental validation is needed to confirm the findings.
1：Experimental Design and Method Selection:
The study is based on the solution of two-band semiconductor Bloch equations (SBEs) to investigate the interaction of an ultrashort midinfrared laser pulse with the MgO crystal.
2：Sample Selection and Data Sources:
The MgO crystal with symmetry-group F m3m was used, and geometric optimizations were performed within generalized gradient approximation.
3：List of Experimental Equipment and Materials:
A linearly polarized laser field propagated along the (cid:2)-X direction of MgO was used.
4：Experimental Procedures and Operational Workflow:
The interaction was modeled using SBEs, and the harmonic spectrum was calculated based on the Fourier-transformed total current.
5：Data Analysis Methods:
The harmonic spectrum was analyzed to identify the Cooper minimum structure and its relation to the TDM.
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