Zheng Huying, Wang Runchen, Gong Xuebing, Dong Junxing, Wang Lisheng, Wang Jingzhuo, Zhang Yifan, Shen Yan, Chen Huanjun, Zhang Baijun, Zhu Hai
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China.
State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
Nanomaterials (Basel). 2024 Jul 14;14(14):1197. doi: 10.3390/nano14141197.
Exciton-polaritons, which are bosonic quasiparticles with an extremely low mass, play a key role in understanding macroscopic quantum effects related to Bose-Einstein condensation (BEC) in solid-state systems. The study of trapped polaritons in a potential well provides an ideal platform for manipulating polariton condensates, enabling polariton lasing with specific formation in k-space. Here, we realize quantized microcavity polariton lasing in simple harmonic oscillator (SHO) states based on spatial localized excitons in InGaN/GaN quantum wells (QWs). Benefiting from the high exciton binding energy (90 meV) and large oscillator strength of the localized exciton, room-temperature (RT) polaritons with large Rabi splitting (61 meV) are obtained in a strongly coupled microcavity. The manipulation of polariton condensates is performed through a parabolic potential well created by optical pump control. Under the confinement situation, trapped polaritons are controlled to be distributed in the selected quantized energy sublevels of the SHO state. The maximum energy spacing of 11.3 meV is observed in the SHO sublevels, indicating the robust polariton trapping of the parabolic potential well. Coherent quantized polariton lasing is achieved in the ground state of the SHO state and the coherence property of the lasing is analyzed through the measurements of spatial interference patterns and g(τ). Our results offer a feasible route to explore the manipulation of macroscopic quantum coherent states and to fabricate novel polariton devices towards room-temperature operations.
激子极化激元是一种质量极低的玻色子准粒子，在理解固态系统中与玻色 - 爱因斯坦凝聚（BEC）相关的宏观量子效应方面起着关键作用。对势阱中捕获的极化激元的研究为操控极化激元凝聚物提供了一个理想平台，能够在k空间中实现具有特定形成的极化激元激光发射。在此，我们基于InGaN/GaN量子阱（QW）中的空间局域激子，在简谐振子（SHO）态中实现了量子化微腔极化激元激光发射。受益于局域激子的高激子结合能（90 meV）和大振荡强度，在强耦合微腔中获得了具有大拉比分裂（61 meV）的室温（RT）极化激元。通过光泵浦控制产生的抛物线势阱来操控极化激元凝聚物。在限制条件下，捕获的极化激元被控制分布在SHO态选定的量子化能量子能级中。在SHO子能级中观察到最大能量间距为11.3 meV，表明抛物线势阱对极化激元具有强大的捕获能力。在SHO态的基态中实现了相干量子化极化激元激光发射，并通过测量空间干涉图样和g(τ)来分析激光发射的相干特性。我们的结果为探索宏观量子相干态的操控以及制造面向室温操作的新型极化激元器件提供了一条可行途径。
