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 ...
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 ...
such as free charge carriers66or intralayer excitons67, we use an optical excitation energy of 1.50 eV for all remaining measurements. This energy is at the onset of the interlayer exciton PL spectrum, Fig.1d (iii), and below the optical bandgaps of WSe2and WS2monolayers. Figure1e dis...
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...
(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 ...
Measurement of high exciton binding energy in the monolayer transition-metal dichalcogenides WS2 and WSe2. Solid State Commun 2015;203:16-20.Hanbicki, A., Currie, M., Kioseoglou, G., Friedman, A. & Jonker, B. Measurement of high exciton binding energy in the monolayer transition-metal ...
WSe 2 /2L-WS 2 and 2L-WSe 2 /2L-WS 2 few-layer heterostructures. We demonstrate that the layer thickness determines the sequence of intralayer exciton relaxation and interlayer charge transfer. The valley transfer of the band edge induced by the layer thickness can effectively mediate the hot...
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,...
Due to the strong Coulomb interaction, the electron–hole pair remain bound as the interlayer exciton. Fig. 1: Interlayer exciton PL revealing correlated states in angle-aligned WSe2/WS2 heterobilayer. a Schematic of the hBN encapsulated WS2/WSe2 heterobilayer. One piece of few-layer graphene ...