Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices.
Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices.
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扭曲 WSe(2)/WSe(2) 同双层超晶格中莫尔层内激子的证据。
DOI：
10.1038/s41377-022-00854-0
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发表时间：
2022-06-01
影响因子：
19.4
通讯作者：
Liu, Yanping
中科院分区：
文献类型：
--
作者：
Wu, Biao;Zheng, Haihong;Li, Shaofei;Ding, Junnan;He, Jun;Zeng, Yujia;Chen, Keqiu;Liu, Zongwen;Chen, Shula;Pan, Anlian;Liu, Yanping
扭曲货车德瓦耳斯异质超晶格的最新进展已经成为一个强大的和有吸引力的平台，探索新的凝聚态物理之间的相互作用的摩尔势和库仑相互作用。莫尔超晶格作为空间中的周期性约束势来捕获层间激子（IX），从而产生莫尔激子阵列，这为量子发射器和多体物理提供了机会。在扭曲的过渡金属二硫属化物（TMD）异质结构中观察到莫尔IX最近被广泛报道。然而，基于TMD扭曲双层（T-HB）的莫尔层内激子的捕获和研究仍然是一个难题。在这里，我们报告的云纹层内激子在WSe 2/WSe 2 T-HB与一个小的扭曲角，通过测量PL光谱的观察。能量范围为1.55-1.73 eV的多分裂峰不同于单层WSe 2激子峰。分裂峰是由通过莫尔电位捕获层内激子引起的。通过改变温度、激光功率和谷极化，进一步证明了莫尔势对莫尔层内激子的限制作用。我们的发现为探索新的关联量子现象及其应用提供了新的途径。在扭曲的WSe_2/WSe_2同质双层超晶格中成功地观察到了莫尔层内激子，证实了莫尔层内激子的存在。
Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moiré potential and Coulomb interactions. The moiré superlattices act as a periodic confinement potential in space to capture interlayer excitons (IXs), resulting in moiré exciton arrays, which provide opportunities for quantum emitters and many-body physics. The observation of moiré IXs in twisted transition-metal dichalcogenide (TMD) heterostructures has recently been widely reported. However, the capture and study of the moiré intralayer excitons based on TMD twisted homobilayer (T-HB) remain elusive. Here, we report the observation of moiré intralayer excitons in a WSe2/WSe2 T-HB with a small twist angle by measuring PL spectrum. The multiple split peaks with an energy range of 1.55–1.73 eV are different from that of the monolayer WSe2 exciton peaks. The split peaks were caused by the trapping of intralayer excitons via the moiré potential. The confinement effect of the moiré potential on the moiré intralayer excitons was further demonstrated by the changing of temperature, laser power, and valley polarization. Our findings provide a new avenue for exploring new correlated quantum phenomena and their applications. The moiré intralayer excitons in the twisted WSe2/WSe2 homobilayers superlattices were successfully observed and confirmed the existence of moiré intralayer excitons.
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影响因子：
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