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arXiv 1609.01554cond-mat.quant-gas
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染料微腔热化和凝聚光子的相空间观

Phase-space views into dye-microcavity thermalised and condensed photons

Jakov Marelic, Benjamin T. Walker, Robert A. Nyman

摘要:

我们已经观察到动量和位置分辨光谱和图像的光致发光从热化和凝聚染料微腔光子。光谱产生光子的色散关系和势能景观。从这个色散关系,我们发现,有效质量是一个自由光子,而不是极化激元。我们把上界的无量纲二维相互作用强度的$\tilde{g}\lesssim 10^{-3}$,这是与现有的估计兼容。光子-光子和光子-分子相互作用都很弱。发现温度与动量无关,但依赖于泵浦光斑的大小,表明系统是遍历的,但不是完全处于热平衡。凝结总是首先发生在具有最低势能和最低动能的模式中,尽管在非常高的泵浦功率下,多模凝结发生在其他模式中。

英文摘要:

We have observed momentum- and position-resolved spectra and images of the photoluminescence from thermalised and condensed dye-microcavity photons. The spectra yield the dispersion relation and the potential energy landscape for the photons. From this dispersion relation, we find that the effective mass is that of a free photon not a polariton. We place an upper bound on the dimensionless two-dimensional interaction strength of $\tilde{g}\lesssim 10^{-3}$, which is compatible with existing estimates. Both photon-photon and photon-molecule interactions are weak. The temperature is found to be independent of momentum, but dependent on pump spot size, indicating that the system is ergodic but not perfectly at thermal equilibrium. Condensation always happens first in the mode with lowest potential and lowest kinetic energy, although at very high pump powers multimode condensation occurs into other modes.

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