arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09958physics.opticscond-mat.other
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极化子玻色-爱因斯坦凝聚体的腔光力学

Cavity Optomechanics with Polariton Bose-Einstein Condensates

D. L. Chafatinos, A. S. Kuznetsov, A. E. Bruchhausen, A. A. Reynoso, K. Biermann, P. V. Santos, A. Fainstein

摘要:

我们报道了一个由两能级原子耦合到腔场限制的光模和振动模的混合量子固态系统的实验研究。在这个结合腔量子电动力学和腔光力学的系统中,量子阱中的激子扮演二能级原子的角色,与光场强耦合,产生混合极化激元态。平面光学微腔是横向微结构的,使得极化激元可以被限制在线、3D陷阱和陷阱阵列中,为极化激元能量提供额外的调谐自由度。当增加非共振激光激发功率时,观察到极化激元的玻色-爱因斯坦凝聚。用附加的弱激光探针进行的光机械诱导放大型实验清楚地识别了这些玻色-爱因斯坦凝聚体与限制在相同腔中的20~GHz呼吸样振动的耦合。在单连续波非共振激光激发下,当激光功率超过阱阵列中玻色-爱因斯坦凝聚的阈值时,在玻色-爱因斯坦凝聚体的发射上,伴随着观察到的Mollow-triplet型机械边带,诱导出类似于声子“激光”的机械自振荡.高分辨率光谱光致发光实验的证据表明,这些振动边带分辨线增强时,相邻的陷阱是红色失谐相对于BEC发射在泛音的基本20 GHz的呼吸模式频率。这些结果构成了相干腔极化激元光学力学的第一次演示,并为量子技术,声子激光器和声子-光子双向翻译器的新型混合器件铺平了道路。

英文摘要:

We report the experimental study of a hybrid quantum solid state system comprising two-level artificial atoms coupled to cavity confined optical and vibrational modes. In this system combining cavity quantum electrodynamics and cavity optomechanics, excitons in quantum wells play the role of the two-level atoms and are strongly coupled to the optical field leading to mixed polariton states. The planar optical microcavities are laterally microstructured, so that polaritons can be confined in wires, 3D traps, and arrays of traps, providing an additional tuning degree of freedom for the polariton energies. Upon increasing the non-resonant laser excitation power, a Bose-Einstein condensation of the polaritons is observed. Optomechanical induced amplification type of experiments with an additional weak laser probe clearly identify the coupling of these Bose-Einstein condensates to 20~GHz breathing-like vibrations confined in the same cavities. With single continuous wave non-resonant laser excitation, and once the laser power overpasses the threshold for Bose-Einstein condensation in trap arrays, mechanical self-oscillation similar to phonon ``lasing'' is induced with the concomitant observation of Mollow-triplet type mechanical sidebands on the Bose-Einstein condensate emission. High-resolution spectroscopic photoluminescence experiments evidence that these vibrational side-band resolved lines are enhanced when neighboring traps are red-detuned with respect to the BEC emission at overtones of the fundamental 20 GHz breathing mode frequency. These results constitute the first demonstration of coherent cavity polariton optomechanics and pave the way towards a novel type of hybrid devices for quantum technologies, phonon lasers, and phonon-photon bidirectional translators.

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