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Exciton Superposition across Moiré States in a Semiconducting Moiré Superlattice
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Exciton Superposition across Moiré States in a Semiconducting Moiré Superlattice
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Journal Article
Exciton Superposition across Moiré States in a Semiconducting Moiré Superlattice
2023
Overview
Moiré superlattices of semiconducting transition metal dichalcogenides enable unprecedented spatial control of electron wavefunctions, leading to emerging quantum states. The breaking of translational symmetry further introduces a new degree of freedom: high symmetry moiré sites of energy minima behaving as spatially separated quantum dots. We demonstrate the superposition between two moiré sites by constructing a trilayer WSe
2
/monolayer WS
2
moiré heterojunction. The two moiré sites in the first layer WSe
2
interfacing WS
2
allow the formation of two different interlayer excitons, with the hole residing in either moiré site of the first layer WSe
2
and the electron in the third layer WSe
2
. An electric field can drive the hybridization of either of the interlayer excitons with the intralayer excitons in the third WSe
2
layer, realizing the continuous tuning of interlayer exciton hopping between two moiré sites and a superposition of the two interlayer excitons, distinctively different from the natural trilayer WSe
2
.
The moiré lattice of trilayer WSe
2
and monolayer WS
2
host interlayer excitons localized at different moiré sites. Using an electric field, the authors tune the superposition between two moiré sites via hybridization with intralayer excitons in WSe
2
.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
