Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moiré superlatticeEXCITON theoryELECTRONSTRANSITION metalsELECTRON-electron interactionsPHOTOLUMINESCENCEHeterobilayers of transition metal dichalcogenides (TMDCs) can form a moir茅 superlattice with flat minibands, which enables ...
This energy is at the onset of the interlayer exciton PL spectrum, Fig. 1d (iii), and below the optical bandgaps of WSe2 and WS2 monolayers. Figure 1e displays the PL intensity map under 1.50 eV excitation. The emission is only observed from the heterostructure region with both ...
Figure2a shows the interlayer exciton PL spectra from the flat WS2/WSe2heterostructure for 0.05-μW (black curve), 1-μW (red curve) and 100-μW (blue curve) laser excitation power,P, at 4 K. The spectrally integrated PL intensity of the interlayer exciton with respect toPis shown in...
Pressure-Induced Dynamic Tuning of Interlayer Coupling in Twisted WSe 2 /WSe 2 Homobilayers superlattice for WSe2 bilayers gives rise to hybridized excitons, which lead to the different pressure-evolution exciton behaviors compared to natural WSe2 ... X Xie,J Ding,Wu, BiaoZheng, HaihongLi, ...
8.[3].rossjs,etal.interlayerexcitonoptoelectronicsina2dheterostructurep-njunction.nanolett.17,638-643(2017). [0009] [4].lim-y,etal.epitaxialgrowthofamonolayerwse 2-mos2lateralp-njunctionwithanatomicallysharpinterface.science.349,524-528(2015). ...
Although interlayer excitons were indicated using femtosecond pump–probe spectroscopy, photoluminescence and absorption spectroscopies did not show any evidence of them, suggesting that the interlayer exciton transition is very weak. However, the interlayer coupling for the WSe2/WS2 bilayer heterojunctions ...
(6): 2354–2363 Mixed-dimensional WS2/WSe2/Si unipolar barrier heterostructure for high- performance photodetection Zihao Huang1, Mengmeng Yang1, Zhicong Qiu1, Zhongtong Luo1, Yu Chen2*, Chun Du3*, Jiandong Yao4, Huafeng Dong5, Zhaoqiang Zheng1* and Jingbo Li6 ABSTRACT The use of ...
2 sample (green curve) in both linear (main panel) and logarithmic (inset) scale. The heterostructure PL features a single peak at 1.409eV, corresponding to the emission from the interlayer exciton, and does not show any emission from WSe 2 A exciton. This indicates an efficient interlay...
a, Intralayer A exciton emission of 1L-WS2. b, Interlayer exciton emission of WS2-WSe2 (60°). Blue shifting of emission energy is observed for the interlayer excitons with increased exciton density in the WS2-WSe2 (60°) due to the net repulsive exciton-exciton interaction. In contrast,...
We also find evidence that an excitonic Mott insulator state emerges when one interlayer exciton occupies one moiré cell. Furthermore, the valley polarization of the excitonic Mott insulator state is enhanced by nearly one order of magnitude. Our study demonstrates that the WS2/WSe2 moiré ...