论文标题
GAAS量子井中光诱导的Terahertz增益的观察：辐射两种表面至北方的证据
Observation of Photoinduced Terahertz Gain in GaAs Quantum Wells: Evidence for Radiative Two-Exciton-to-Biexciton Scattering
论文作者
论文摘要
我们已经观察到在低温下强烈垂直磁场的GAAS多量子孔结构中的Terahertz频率范围内的光诱导的负光传导率或增益。增益是狭窄的频带：它看起来像是尖峰（线宽$ <$ 0.45 MEV），其频率随施加的磁场而移动。增益具有圆形偏振选择规则：对于孔 - 环体 - 谐音激活极化，观察到了强线。此外，只有当激发量$ 1S $状态被人口填充时，就会出现增益，这排除了脱发内过渡是其起源。基于这些观察结果，我们提出了一个可能的过程，其中发生了Terahertz光子的刺激发射，而两个游离激子则以能量和Angular-Momentum巩固方式散落到一个Biexciton中。
We have observed photoinduced negative optical conductivity, or gain, in the terahertz frequency range in a GaAs multiple-quantum-well structure in a strong perpendicular magnetic field at low temperatures. The gain is narrow-band: it appears as a sharp peak (linewidth $<$0.45 meV) whose frequency shifts with applied magnetic field. The gain has a circular-polarization selection rule: a strong line is observed for hole-cyclotron-resonance-active polarization. Furthermore, the gain appears only when the exciton $1s$ state is populated, which rules out intraexcitonic transitions to be its origin. Based on these observations, we propose a possible process in which the stimulated emission of a terahertz photon occurs while two free excitons scatter into one biexciton in an energy and angular-momentum conserving manner.
