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Proximity control of interlayer exciton-phonon hybridization in van der Waals heterostructures
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Proximity control of interlayer exciton-phonon hybridization in van der Waals heterostructures
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Journal Article
Proximity control of interlayer exciton-phonon hybridization in van der Waals heterostructures
2021
Overview
Van der Waals stacking has provided unprecedented flexibility in shaping many-body interactions by controlling electronic quantum confinement and orbital overlap. Theory has predicted that also electron-phonon coupling critically influences the quantum ground state of low-dimensional systems. Here we introduce proximity-controlled strong-coupling between Coulomb correlations and lattice dynamics in neighbouring van der Waals materials, creating new electrically neutral hybrid eigenmodes. Specifically, we explore how the internal orbital 1
s
-2
p
transition of Coulomb-bound electron-hole pairs in monolayer tungsten diselenide resonantly hybridizes with lattice vibrations of a polar capping layer of gypsum, giving rise to exciton-phonon mixed eigenmodes, called excitonic Lyman polarons. Tuning orbital exciton resonances across the vibrational resonances, we observe distinct anticrossing and polarons with adjustable exciton and phonon compositions. Such proximity-induced hybridization can be further controlled by quantum designing the spatial wavefunction overlap of excitons and phonons, providing a promising new strategy to engineer novel ground states of two-dimensional systems.
Here, the authors demonstrate proximity-controlled strong-coupling between Coulomb correlations and lattice dynamics in neighbouring van der Waals materials (WSe
2
and a gypsum layer), creating electrically neutral hybrid exciton-phonon eigenmodes called
excitonic Lyman polarons
.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
