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arXiv 2211.03399physics.optics
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近强场区布洛赫振荡的起始

Onset of Bloch oscillations in the almost-strong-field regime

Jan Reislöhner, Doyeong Kim, Ihar Babushkin, Adrian N. Pfeiffer

摘要:

在固体产生高次谐波的领域中,电子运动通常超过第一布里渊区的边缘。另一方面,在传统的非线性光学中,带电子的漂移可以忽略不计。在这里,从传统的非线性光学过渡到政权的晶体电子开始探索第一布里渊区进行了研究。结果发现,非线性光学响应的突然变化之前,由于电离带内电流成为主导。这是通过在非共线几何结构中的几个周期脉冲的三阶谐波产生中的干涉结构观察到的。虽然接近Keldysh参数$γ= 1$,但这不是原始意义上的强场效应,因为迭代级数仍然收敛并再现干涉结构。非线性带间响应的变化归因于可逆(或瞬态或虚拟)人口的布洛赫运动,类似于影响高次谐波产生中观察到的带内电流的不可逆(或真实)人口的布洛赫运动。

英文摘要:

In the field of high-order harmonic generation from solids, the electron motion typically exceeds the edge of the first Brillouin zone. In conventional nonlinear optics, on the other hand, the excursion of band electrons is negligible. Here, the transition from conventional nonlinear optics to the regime where the crystal electrons begin to explore the first Brillouin zone is investigated. It is found that the nonlinear optical response changes abruptly already before intraband currents due to ionization become dominant. This is observed by an interference structure in the third-order harmonic generation of few-cycle pulses in a non-collinear geometry. Although approaching Keldysh parameter $γ= 1$, this is not a strong-field effect in the original sense, because the iterative series still converges and reproduces the interference structure. The change of the nonlinear interband response is attributed to Bloch motion of the reversible (or transient or virtual) population, similar to the Bloch motion of the irreversible (or real) population which affects the intraband currents that have been observed in high-order harmonic generation.

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