Probing the inter-layer exciton physics in a MoS/MoSe/MoS van der Waals heterostructure
arXiv:1709.04150 · doi:10.1021/acs.nanolett.7b03184
Abstract
Stacking atomic monolayers of semiconducting transition metal dichalcogenides (TMDs) has emerged as an effective way to engineer their properties. In principle, the staggered band alignment of TMD heterostructures should result in the formation of inter-layer excitons with long lifetimes and robust valley polarization. However, these features have been observed simultaneously only in MoSe/WSe heterostructures. Here we report on the observation of long lived inter-layer exciton emission in a MoS/MoSe/MoS trilayer van der Waals heterostructure. The inter-layer nature of the observed transition is confirmed by photoluminescence spectroscopy, as well as by analyzing the temporal, excitation power and temperature dependence of the inter-layer emission peak. The observed complex photoluminescence dynamics suggests the presence of quasi-degenerate momentum-direct and momentum-indirect bandgaps. We show that circularly polarized optical pumping results in long lived valley polarization of inter-layer exciton. Intriguingly, the inter-layer exciton photoluminescence has helicity opposite to the excitation. Our results show that through a careful choice of the TMDs forming the van der Waals heterostructure it is possible to control the circular polarization of the inter-layer exciton emission.
arXiv comment19 pages, 3 figures. Just accepted for publication in Nano Letters (http://pubs.acs.org/doi/10.1021/acs.nanolett.7b03184)
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- Nanophotonics with 2D Transition Metal Dichalcogenides
- Moiré Intralayer Excitons in a MoSe/MoS Heterostructure
- Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
- Intrinsic Lifetime of Higher Excitonic States in Tungsten Diselenide Monolayers
- Observation of Inter-layer Excitons in MoSe2 Single Crystals
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