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arXiv 0709.4372cond-mat.mtrl-sci
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GaAs微腔中的光子激光:与极化激元凝聚体的相似性

Photon lasing in a GaAs microcavity: similarities with a polariton condensate

Daniele Bajoni, Pascale Senellart, Aristide Lemaître, Jacqueline Bloch

摘要:

实验研究了GaAs基微腔样品在强光抽运下的激射机制。非常相同的样品表现出强耦合制度,在低激发功率与拉比分裂高达15毫电子伏。我们发现,当腔表现为规则光子激光器时,在弱耦合区也观察到一些可被认为是极化激元玻色-爱因斯坦凝聚的实验证据的特征。特别是,在激光制度的发射模式显示出一个尖锐的峰值附近的能量最小值,其次是玻尔兹曼分布在较高的能量。

英文摘要:

We study experimentally the lasing regime of a GaAs based microcavity sample under strong optical pumping. The very same sample exhibits the strong coupling regime at low excitation power with a Rabi splitting as large as 15 meV. We show that some features which may be considered as experimental evidence of polariton Bose Einstein condensation are also observed in the weak coupling regime when the cavity is behaving as a regular photon laser. In particular, the emission pattern in the lasing regime displays a sharp peak near the energy minimum followed by a Boltzmann distribution at higher energies.

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