This tunability is based on the unique properties of bilayer MoS2, that shows strong optical oscillator strength for the intra- but also inter-layer exciton resonances. As we tune the SHG signal onto these resonances by varying the laser energy, the SHG amplitude is enhanced by several orders ...
where S2His the measured A–B exciton splitting of the as-grown 2H MoS2bilayer and as a value for ΔSOwe take the measured A–B separation in the 3R sample. For S2H = 183 meV and ΔSO = 155 meV, we obtaint⊥ ≈ 49 meV. This value can be compared to the ...
We show this originates from the rich gap control and screening physics of TMDCs in a bilayer geometry: gating the bilayer acts on one hand to increase intra-layer screening by reducing the gap and, on the other hand, to decrease the inter-layer screening by field induced charge depletion....
This work reports the interlayer difference of exciton and phonon performance between the top and bottom layer of a bilayer-stacked two-dimensional materials structure (BSS). Through photoluminescence (PL) and Raman spectroscopy, we find that, compared to that of the bottom layer, the top layer ...
Theoretical and first-principal studies involving twisted two-dimensional (2D) heterobilayer transition metal dichalcogenides (TMDs) predict interlayer exciton (ILE) emission energy amplitudes (the energy difference between the lowest and the highest ILE emission energies) in the range of 100-260 meV. ...
Bilayer van der Waals (vdW) heterostructures such as MoS2/WS2 and MoSe2/WSe2 have attracted much attention recently, particularly because of their type II ... S Gao,L Yang,CD Spataru - 《Nano Letters》 被引量: 14发表: 2017年 Dynamics of exciton recombination in low-dimensional heterostructu...
The PL emission peak related to A exciton located at around 678 nm [25] for both samples shows a red-shift comparing to mono-layer MoS2, which is normally 660 nm [26]. The intensity of tri-layer emission is halved compared to that of the bi-layer, resulted from higher degree of...
Here, we report fabrication and comprehensive characterizations of WSe2/WS2 bilayer heterojunctions with various twist angles that were synthesized by artificially stacking monolayers of WS2 and WSe2 grown by chemical vapor deposition. After annealing the WSe2/WS2 bilayers, Raman spectroscopy reveals...
(NIX ~ 1–5) within a nanoscale confinement potential induced by placing a MoSe2–WSe2hetero-bilayer (HBL) onto an array of SiO2nanopillars. We control the mean occupation of the IX trap via the optical excitation level and observe discrete sharp-line emission from different configurations...
applied vertical gate voltage. Moreover, we measure an interlayer exciton lifetime of ~1.8 ns, an order of magnitude longer than intralayer excitons in monolayers. Our work demonstrates optical pumping of interlayer electric polarization, which may provoke further exploration of interlayer exciton co...