All-optical dynamic tuning of local excitonic emission of monolayer MoS2 by integration with Ge2Sb2Te5
All-optical dynamic tuning of local excitonic emission of monolayer MoS2 by integration with Ge2Sb2Te5
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通过与 Ge2Sb2Te5 集成对单层 MoS2 局域激子发射进行全光动态调谐
DOI：
10.1515/nanoph-2019-0366
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发表时间：
2020-04
期刊：
影响因子：
7.5
通讯作者：
Tian Jiang
中科院分区：
文献类型：
--
作者：
Hao Ouyang;Haitao Chen;Yuxiang Tang;Jun Zhang;Chenxi Zhang;Bin Zhang;Xiang'ai Cheng;Tian Jiang
摘要强的量子限制和库仑相互作用在过渡金属二硫属化物（TMD）原子薄层中诱导出激子和三电子等紧密束缚的准粒子，这些准粒子在决定其有趣的光电性质方面起着主导作用。因此，控制激子性质对于基于TMD的器件的应用至关重要。在这里，我们展示了从单层MoS 2与相变材料Ge 2Sb 2 Te 5（GST）薄膜杂交的局部激子发射的全光调谐。通过对MoS 2/GST异质结构施加不同功率的脉冲激光，MoS 2的激子发射峰值能量可调谐至40 meV，激子/三电子强度比可调谐至少一个数量级。拉曼光谱和瞬态泵浦-探测测量结果表明，这种可调谐性源于GST薄膜的激光诱导相变，电荷从GST转移到单层MoS 2。激子发射的动态调谐都是在局域激光脉冲作用下实现的，并且可以很容易地进行定标，这为控制TMD中激子发射开辟了一条新的途径。我们的研究结果可能被用作未来光网络中的全光调制器或开关。
Abstract Strong quantum confinement and coulomb interactions induce tightly bound quasiparticles such as excitons and trions in an atomically thin layer of transitional metal dichalcogenides (TMDs), which play a dominant role in determining their intriguing optoelectronic properties. Thus, controlling the excitonic properties is essential for the applications of TMD-based devices. Here, we demonstrate the all-optical tuning of the local excitonic emission from a monolayer MoS2 hybridized with phase-change material Ge2Sb2Te5 (GST) thin film. By applying pulsed laser with different power on the MoS2/GST heterostructure, the peak energies of the excitonic emission of MoS2 can be tuned up to 40 meV, and the exciton/trion intensity ratio can be tuned by at least one order of magnitude. Raman spectra and transient pump-probe measurements show that the tunability originated from the laser-induced phase change of the GST thin film with charge transferring from GST to the monolayer MoS2. The dynamic tuning of the excitonic emission was all done with localized laser pulses and could be scaled readily, which pave a new way of controlling the excitonic emission in TMDs. Our findings could be potentially used as all-optical modulators or switches in future optical networks.
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