Solid State Electrically Injected Exciton-Polariton Laser
Solid State Electrically Injected Exciton-Polariton Laser
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DOI：
10.1103/physrevlett.110.206403
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发表时间：
2013-05-15
影响因子：
8.6
通讯作者：
Heo, Junseok
中科院分区：
文献类型：
--
作者：
Bhattacharya, Pallab;Xiao, Bo;Heo, Junseok
在非共振激发下，简并极化激元凝聚体通过自发辐射复合可以获得无反转的超低阈值相干辐射，或称极化激元激光。迄今为止，这种激发是由光源提供的。本文观察到了电注入GaAs基量子阱微腔二极管的相干辐射。这是通过威尔斯的调制掺杂的组合来实现的，以引起极化激元-电子散射，以及在法拉第几何形状中施加磁场以增强激子-极化激元饱和密度。这些措施有助于克服弛豫瓶颈，并形成一个宏观的和简并的冷凝物证明了角分辨发光，光电流特性，空间相干性，和输出偏振。实验在30 K，外加磁场为7 T的条件下进行.
Inversionless ultralow threshold coherent emission, or polariton lasing, can be obtained by spontaneous radiative recombination from a degenerate polariton condensate with nonresonant excitation. Such excitation has, hitherto, been provided by an optical source. Coherent emission from a GaAs-based quantum well microcavity diode with electrical injection is observed here. This is achieved by a combination of modulation doping of the wells, to invoke polariton-electron scattering, and an applied magnetic field in the Faraday geometry to enhance the exciton-polariton saturation density. These measures help to overcome the relaxation bottleneck and to form a macroscopic and degenerate condensate as evidenced by angle-resolved luminescence, light-current characteristics, spatial coherence, and output polarization. The experiments were performed at 30 K with an applied field of 7 T.