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Intervalence Transverse-electric Mode Terahertz Lasing Without Population Inversion

机译:间隔反转电模式太赫兹激光无人口反转

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This paper applies the Keldysh nonequilibrium Green's-function formalism to introduce the concept of k-space filtering due to the strong localization of the intervalence transverse-electric (TE) dipole moments in Ⅲ-V quantum wells. The effect enhances the gain without inversion for holes under nonequilibrium conditions that results from the strong valence-band nonparabolicity and can potentially lead to terahertz lasing at high temperatures. Numerical solutions of the integrodifferential susceptibility equation derived from the microscopic carrier Green's functions are discussed. The approach consistently takes into account the interplay of nonequilibrium nonparabolicity many-body, and dephasing effects as well as the detrimental influence of cross absorption due to the multiple subband transitions.
机译:本文利用Keldysh非平衡格林函数形式论来介绍k空间滤波的概念,这是由于间隔横向电(TE)偶极矩在Ⅲ-Ⅴ量子阱中的强定位所致。这种效应提高了增益,在不平衡条件下空穴不反转,这是由强价带非抛物线引起的,并可能在高温下导致太赫兹激光发射。讨论了从微观载体格林函数导出的积分微分磁化率方程的数值解。该方法始终考虑到非平衡非抛物线多体的相互作用,移相效应以及由于多个子带跃迁而引起的交叉吸收的有害影响。

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