Coupling of photonic crystal cavity and interlayer exciton in heterobilayer of transition metal dichalcogenides
Coupling of photonic crystal cavity and interlayer exciton in heterobilayer of transition metal dichalcogenides
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过渡金属二硫化物异质双层中光子晶体腔与层间激子的耦合
DOI：
10.1088/2053-1583/ab597d
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发表时间：
2020
期刊：
影响因子：
5.5
通讯作者：
Majumdar, Arka
中科院分区：
文献类型：
--
作者：
Rivera, Pasqual;Fryett, Taylor K;Chen, Yueyang;Liu, Chang-Hua;Ray, Essance;Hatami, Fariba;Yan, Jiaqiang;Mandrus, David;Yao, Wang;Majumdar, Arka
范德华异质结构的出现标志着一类新的合成材料的出现，这些材料具有其组成材料所无法达到的新颖性能。这些层状材料的2D结构使其自然适合于与各种平面纳米光子腔集成，用于下一代低功率光电子器件和探索这些新系统中的基本物理效应。在这里，我们报道了过渡金属二卤化物异质双层中的层间激子与磷化镓光子晶体缺陷腔的耦合。发现激子-腔耦合处于弱区，导致层间激子与腔共振时的光致发光强度增加约15倍。模拟结果表明，强度的增加源于~60的Purcell增强。光致发光产额的数量级提高抵消了层间激子的低振子强度，为探索这个激子系统的基本物理增加了一个新的工具。
The advent of van der Waals heterostructures marks the emergence of a new class of synthetic materials with novel properties that are unattainable in their constituent materials. The 2D architecture of these layered materials makes them naturally suited for integration with a wide variety of planar nanophotonic cavities for next-generation low-power optoelectronic devices and explorations of fundamental physical effects in these new systems. Here, we report the coupling of the interlayer exciton in a transition metal dichalcogenide heterobilayer with a gallium phosphide photonic crystal defect cavity. The exciton-cavity coupling is found to be in the weak regime, resulting in~ 15-fold increase in the photoluminescence intensity for interlayer exciton in resonance with the cavity. Simulation results suggest that the increased intensity stems from a Purcell enhancement of~ 60. The order of magnitude enhancement of the photoluminescence yield offsets the low oscillator strength of the interlayer exciton, adding a new tool for probing the underlying physics of this excitonic system.
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影响因子：
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作者：
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通讯作者：
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