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Nonlinear transport in n-Ⅲ-nitrides: Selective amplification and emission of coherent LO phonons

机译:n-Ⅲ族氮化物中的非线性传输:相干LO声子的选择性放大和发射

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摘要

The nonequilibrium macrostate of the LO phonon system in strongly-polar n-doped Ⅲ-nitrides, in the presence of electric fields of intermediate to high intensities, is characterized. The emergence of a kind of resonance consisting in the selective amplification of LO vibrations in a privileged and localized off-centre region of the Brillouin zone is demonstrated. It has an associated phenomenon akin to a Cherenkov-like effect involving a preferential emission of LO phonons in a selected cone with its axis along the direction of the electric field. Moreover, it has predicted the onset of emission (stimulated amplification) of weakly decaying coherent LO phonons generated by the drifting electrons.
机译:在中等强度到高强度电场存在的情况下,表征了在强极性n掺杂的Ⅲ族氮化物中LO声子系统的非平衡宏观态。证明了一种共振的出现,该共振包括在布里渊区的特权和局部偏心区域中,LO振动的选择性放大。它具有类似于Cherenkov效应的相关现象,该效应涉及在选定的圆锥体中优先发射LO声子,该圆锥体的轴沿电场方向。此外,它已经预测了由漂移电子产生的弱衰减相干LO声子的发射(受激放大)的开始。

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