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首页> 外文期刊>Physical review >Quantum-coherence-induced second plateau in high-sideband generation
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Quantum-coherence-induced second plateau in high-sideband generation

机译：高边带产生中的量子相干诱导的第二平台

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摘要

Optically excited electron-hole pairs, driven by a strong terahertz (THz) field, create high sidebands in the optical spectrum. The sideband spectrum exhibits a "plateau" up to a cutoff of 3.17U_p, where U_p is the ponderomotive energy. This cutoff is determined, semiclassically, from the maximum kinetic energy an electron-hole pair can gain from the THz field along a closed trajectory. A full quantum treatment reveals a second, classically forbidden, plateau with a cutoff of 8U_p, the maximum kinetic energy an electron-hole pair can gain from the THz field along an open trajectory. The second plateau appears because a spatially separated electron and hole can still recombine if the classical excursion is less than the width of the electron-hole wave function, which occurs when the coherence time is longer than the excursion time (half the THz field period). This effect broadens the range of materials and excitation conditions where high-sideband generations can occur, thereby providing a wealth of systems for ultrafast electro-optical applications.
机译：由太赫兹（THz）场驱动的光激发电子-空穴对在光谱中产生高边带。边带频谱表现出一个“平稳”状态，截止到3.17U_p，其中U_p是动能。半截断是由电子-空穴对可以沿闭合轨迹从太赫兹场获得的最大动能确定的。完整的量子处理揭示了第二个经典禁区，其截断值为8U_p，这是电子-空穴对可沿开放轨迹从太赫兹场获得的最大动能。之所以出现第二个平稳期，是因为如果经典偏移小于电子-空穴波函数的宽度（在相干时间长于偏移时间（THz场周期的一半）时发生），则空间上分离的电子和空穴仍然可以重新结合。这种效应扩大了可能发生高边带产生的材料和激发条件的范围，从而为超快电光应用提供了丰富的系统。

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