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Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2
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Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2
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Journal Article
Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2
2023
Overview
Fano resonance which describes a quantum interference between continuum and discrete states, provides a unique method for studying strongly interacting physics. Here, we report a Fano resonance between dark excitons and zone-edged acoustic phonons in few-layer WS
2
by using the resonant Raman technique. The discrete phonons with large momentum at the M-point of the Brillouin zone and the continuum dark exciton states related to the optically forbidden transition at K and Q valleys are coupled by the exciton-phonon interactions. We observe rich Fano resonance behaviors across layers and modes defined by an asymmetry-parameter
q
: including constructive interference with two mirrored asymmetry Fano peaks (weak coupling,
q
> 1 and
q
< − 1), and destructive interference with Fano dip (strong coupling, ∣
q
∣ < < 1). Our results provide new insight into the exciton-phonon quantum interference in two-dimensional semiconductors, where such interferences play a key role in their transport, optical, and thermodynamic properties.
Here, the authors investigate the Raman spectra of few-layered WS
2
when the excitation energy is in resonance with the dark exciton, and observe a Fano resonance between dark excitonsand zone-edge acoustic phonons.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
