Proximity control of interlayer exciton-phonon hybridization in van der Waals heterostructures
Journal
Nature Communications
Journal Volume
12
Journal Issue
1
Date Issued
2021
Author(s)
Abstract
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 1s-2p 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. ? 2021, The Author(s).
Subjects
calcium sulfate; quantum dot; tungsten derivative; correlation; eigenvalue; electron; hybridization; lattice dynamics; spatial analysis; tungsten; Article; chemical structure; dynamics; electron; hybridization; phonon; photoluminescence; spectroscopy; vibration; waveform
Type
journal article