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Download fileResonant Coupling of a Moiré Exciton to a Phonon in a WSe2/MoSe2 Heterobilayer
journal contribution
posted on 16.07.2021, 14:07 authored by Keisuke Shinokita, Yuhei Miyauchi, Kenji Watanabe, Takashi Taniguchi, Kazunari MatsudaMoiré
patterns with an angular mismatch in van der Waals
heterostructures are a fascinating platform to engineer optically
generated excitonic properties. The moiré pattern can give
rise to spatially ordered exciton ensembles, which offer the possibility
for coherent quantum emitters and quantum simulation of many-body
physics. The intriguing moiré exciton properties are affected
by their dynamics and exciton–phonon interaction. Here, we
report the moiré exciton and phonon interaction in a twisted
WSe2/MoSe2 heterobilayer. By tuning the excitation
energy, we realized the selective excitation of the moiré exciton
at phonon resonances and the otherwise negligible small absorption.
Furthermore, we revealed the relaxation of moiré exciton ensembles
between different potential minima via the resonant phonon scattering
process. Our findings highlight resonant coupling of a moiré
exciton to a phonon and could pave a new way for the exploration of
novel quantum phenomena of the moiré exciton.