Polariton Laser in the Bardeen-Cooper-Schrieffer Regime
Polariton Laser in the Bardeen-Cooper-Schrieffer Regime
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DOI：
10.1103/physrevx.11.011018
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发表时间：
2021-01-28
影响因子：
12.5
通讯作者：
Binder, Rolf
中科院分区：
文献类型：
--
作者：
Hu, Jiaqi;Wang, Zhaorong;Binder, Rolf
微腔激子极化系统具有广泛的宏观量子效应，可以转化为更好的光子技术。极化子玻色-爱因斯坦凝聚和光子激光在低载流子密度和高载流子密度的限制下被广泛接受，但由于光增益机制不能直接从现有的实验中推断出来，在中等密度下预期的bardeen - coopero - schrieffer （BCS）状态的识别仍然是难以实现的。在这里，我们使用一个具有强偏振选择性的微腔，获得了在极化子凝聚和激光存在下的储层吸收的直接实验，揭示了极化子激光背后的费米子增益机制。微观多粒子理论表明，这种极化激子的激光状态与开放耗散泵浦系统中类似的极化激子BCS状态是一致的。
Microcavity exciton polariton systems can have a wide range of macroscopic quantum effects that may be turned into better photonic technologies. Polariton Bose-Einstein condensation and photon lasing have been widely accepted in the limits of low and high carrier densities, but identification of the expected Bardeen-Cooper-Schrieffer (BCS) state at intermediate densities remains elusive, as the optical-gain mechanism cannot be directly inferred from existing experiments. Here, using a microcavity with strong polarization selectivity, we gain direct experimental access to the reservoir absorption in the presence of polariton condensation and lasing, which reveals a fermionic gain mechanism underlying the polariton laser. A microscopic many-particle theory shows that this polariton lasing state is consistent with an open-dissipative-pumped system analog of a polaritonic BCS state.