富勒烯分子中的高次谐波
High harmonic generation in fullerene molecules
摘要：
利用动力学Hartree-Fock平均场论研究了富勒烯分子C $_{60}$和C $_{70}$在强泵浦光驱动下的高次谐波产生。我们认为一个强场制度，并表明输出谐波辐射表现出多个平台，其边界所定义的分子激子线和截止能量在每个平台尺度线性与场强振幅。与富勒烯分子的原子情况相反，随着泵浦光光子能量的增加，截止谐波能量增加。我们还发现，随着电子-电子相互作用能的增加，HHG速率总体上被抑制。结果表明，C-$_{70}$分子具有比C-$_{60}$更丰富的HHG谱和更强的高次谐波强度。
英文摘要：
Using dynamical Hartree-Fock mean-field theory, we study the high-harmonic generation (HHG) in the fullerene molecules C$_{60}$ and C$_{70}$ under strong pump wave driving. We consider a strong-field regime and show that the output harmonic radiation exhibits multiple plateaus, whose borders are defined by the molecular excitonic lines and cutoff energies within each plateau scale linearly with the field strength amplitude. In contrast to atomic cases for the fullerene molecule, with the increase of the pump wave photon energy the cutoff harmonic energy is increased. We also show that with the increase of the electron-electron interaction energy overall the HHG rate is suppressed. We demonstrate that the C$_{70}$ molecule shows richer HHG spectra and a stronger high-harmonic intensity than the C$_{60}$.
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