Ultralow Threshold Polariton Condensate in a Monolayer Semiconductor Microcavity at Room Temperature,Nano Letters

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Ultralow Threshold Polariton Condensate in a Monolayer Semiconductor Microcavity at Room Temperature
Nano Letters ( IF 9.6 ) Pub Date : 2021-04-02 , DOI: 10.1021/acs.nanolett.1c01162
Jiaxin Zhao ₁ , Rui Su ₁ , Antonio Fieramosca ₁ , Weijie Zhao ₁ , Wei Du ₁ , Xue Liu ₁ , Carole Diederichs _{2,

3} , Daniele Sanvitto ₄ , Timothy C. H. Liew _{1,

2} , Qihua Xiong _{1,

5,

6}

Affiliation

Exciton-polaritons, hybrid light–matter bosonic quasiparticles, can condense into a single quantum state, i.e., forming a polariton Bose–Einstein condensate (BEC), which represents a crucial step for the development of nanophotonic technology. Recently, atomically thin transition-metal dichalcogenides (TMDs) emerged as promising candidates for novel polaritonic devices. Although the formation of robust valley-polaritons has been realized up to room temperature, the demonstration of polariton lasing remains elusive. Herein, we report for the first time the realization of this important milestone in a TMD microcavity at room temperature. Continuous wave pumped polariton lasing is evidenced by the macroscopic occupation of the ground state, which undergoes a nonlinear increase of the emission along with the emergence of temporal coherence, the presence of an exciton fraction-controlled threshold and the buildup of linear polarization. Our work presents a critically important step toward exploiting nonlinear polariton–polariton interactions, as well as offering a new platform for thresholdless lasing.

中文翻译：

室温下单层半导体微腔中的超低阈值极化子冷凝物

激子-极化子，混合的光-质子玻色子准粒子，可以凝聚成单个量子态，即形成极化子玻色-爱因斯坦凝聚物（BEC），这是纳米光子技术发展的关键一步。近来，原子级薄的过渡金属二卤化二硫（TMDs）成为新型极化电子器件的有前途的候选者。尽管已经在室温下实现了坚固的谷极极化子的形成，但极化子激射的演示仍然难以捉摸。在此，我们首次报告了室温下TMD微腔中这一重要里程碑的实现。连续波泵浦极化子激射由基态的宏观占据来证明，随着时间相干的出现，基态经历了发射的非线性增加，激子分数控制阈值的存在和线性极化的建立。我们的工作为开发非线性极化子-极化子相互作用提供了至关重要的一步，并为无阈值激光提供了新的平台。

更新日期：2021-04-14

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