激子
异质结
单层
光致发光
结合能
双层
比克西顿
材料科学
凝聚态物理
三极管
范德瓦尔斯力
蓝移
原子物理学
物理
化学
光电子学
纳米技术
分子
生物化学
有机化学
膜
作者
Ming Xin,Wenze Lan,Qinghu Bai,Xin Huang,Kenji Watanabe,Takashi Taniguchi,Gang Wang,Changzhi Gu,Baoli Liu
摘要
In this Letter, we present the experimental observation of trilayer exciton emission in the WSe2/WS2/MoS2 heterostructures by photoluminescence spectroscopy at a low temperature of ∼10 K. It is found that the trilayer exciton has a lower exciton binding energy than that in the WSe2/MoS2 heterobilayer due to the insertion of monolayer WS2, which is manifested by the blueshift of this trilayer exciton peak relative to the bilayer exciton. Through the measurements of the exciton peak position as a function of excitation power, the trilayer excitons exhibited the density-dependent repulsive interaction among them, and the reduction of binding energy ∼8 meV is deduced. Moreover, the trilayer exciton has a longer lifetime than the bilayer exciton, resulting from the reduction of electron–hole wavefunction overlap.
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