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arXiv 2012.11732cond-mat.mtrl-sci
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固体$\rm \bf C_{60}$中高次谐波的产生

High-order harmonic generation in solid $\rm \bf C_{60}$

G. P. Zhang, Y. H. Bai

备注：
7 pages, 4 figures, one table
发表信息：
Physical Review B, Vol. 101, 081412(R) (2020)
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摘要：

高次谐波产生（HHG）在固体中释放了强激光物理的力量。在这里，我们调查高次谐波从一个大的系统，固体C $_{60}$，240价电子从事谐波产生在每个晶体的动量，第一次这种。我们采用密度泛函理论和含时的密度矩阵Liouville方程来计算高次谐波信号。我们发现，在中等强度的激光脉冲下，高次谐波信号达到15阶，与C $_{60}$等离子体的实验结果一致。由于C $_{60}$的高对称性，其螺旋度依赖性较弱。与一般的看法相反，HHG不适合用于C $_{60}$中的能带结构映射。然而，我们发现了一个使用长波长的机会窗口，其中通过多光子激发产生谐波。特别地，第五阶谐波能量紧密地遵循价带和导带之间的跃迁能量色散。这一发现有望激发未来的实验研究。

英文摘要：

High harmonic generation (HHG) has unleashed the power of strong laser physics in solids. Here we investigate HHG from a large system, solid C$_{60}$, with 240 valence electrons engaging harmonic generation at each crystal momentum, the first of this kind. We employ the density functional theory and the time-dependent Liouville equation of the density matrix to compute HHG signals. We find that under a moderately strong laser pulse, HHG signals reach 15th order, consistent with the experimental results from C$_{60}$ plasma. The helicity dependence in solid C$_{60}$ is weak, due to the high symmetry. In contrast to the general belief, HHG is unsuitable for band structure mapping in C$_{60}$. However, we find a window of opportunity using a long wavelength, where harmonics are generated through multiple-photon excitation. In particular, the 5th order harmonic energies closely follow the transition energy dispersion between the valence and conduction bands. This finding is expected to motivate future experimental investigations.

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