α-石英中电子-空穴复合产生高次谐波
High-harmonic generation in alpha-quartz by the electron-hole recombination
摘要：
用含时密度泛函理论计算了$α$ -石英晶体中的高次谐波。带间过程是由于带隙以上的高次谐波占主导地位。光子能量被设置为1.55 eV，并且发现平台区域的截止能量被限制在19次谐波（30 eV）处。截止能区的高次谐波效率与最低价带空穴密度的关系与激光强度的关系是一致的。数值结果表明，电子-空穴复合在$α$ -石英的高次谐波中起着至关重要的作用。结果表明，在平台截止能量附近，高次谐波产生了200阿秒的脉冲训练。
英文摘要：
A calculation of the high-harmonic generation (HHG) in $α$-quartz using the time-dependent density functional theory is reported. The inter-band process is attributed to the dominant in HHG above the band gap. The photon energy is set to 1.55 eV, and the cutoff energy of the plateau region is found to be limited at the 19th harmonic (30 eV). The dependence of the HHG efficiency at the cutoff energy region on laser intensity is consistent with that of the hole density in the lowest-lying valence band. Numerical results indicate that electron-hole recombination plays a crucial role in HHG in $α$-quartz. It is found that a 200 attosecond pulse train is produced using HHG around the plateau cutoff energy.
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