周期晶体中高次谐波截止的时间控制
Temporal control of high-order harmonic cutoffs in periodic crystals
AI总结：
本研究针对周期晶体高次谐波产生问题，提出采用sinc形驱动场，通过调控其延迟参数可实现谐波截止的时间控制，还能优化截止能量与产额。
摘要：
本文对合成驱动场下固体中的高次谐波产生（high-harmonic generation, HHG）开展了理论研究。驱动场的矢量势是决定周期晶体中电子布洛赫振荡的关键因素，最终会反映在高次谐波谱中。为此，研究了sinc形驱动场与周期晶体的相互作用。与强度和时长相近的标准sin²包络相比，其关联矢量势的典型时间分布可拓展谐波截止频率。研究还发现，通过改变所提出的sinc形驱动场中引入的延迟参数，可对谐波截止进行时间控制，且存在明确的标度关系，该标度依赖于所研究周期晶体的能带。此外，系统改变延迟参数还可控制截止谐波的发射时间，甚至谐波截止能量。本文还推导了获得最大谐波截止能量和谐波产额的最优延迟参数。
英文摘要：
A theoretical study on the high-harmonic generation (HHG) in solids by a synthesized driver field is carried out. The vector potential of the driver field is instrumental in determining the Bloch oscillations of the electrons in a periodic crystal, which eventually reflects in the high-order harmonic spectra. To this end, the interaction of the sinc-shaped driver with the periodic crystal is studied. A typical temporal profile of the associated vector potential manifests in extending the harmonic cutoffs compared to the standard sin$^2$ envelopes of similar intensity and duration. It is also observed that the harmonic cutoffs can be controlled in a temporal manner by varying the delay parameter introduced in the proposed sinc-shaped driver, with a well-defined scaling that depends on the energy bands of the periodic crystal under study. Furthermore, it is also observed that the emission time of the cutoff harmonics and even the harmonic cutoff energy can also be controlled by varying the delay parameter systematically. An optimum delay parameter for maximum harmonic cutoff energy and harmonic yield is also deduced.
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