Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe$_2$
Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe$_2$
物理学
Shun Feng,Aidan J. Campbell,Bibi Mary Francis,Hyeonjun Baek,Takashi Taniguchi,Kenji Watanabe,Iann C. Gerber,Brian D. Gerardot,Mauro Brotons-Gisbert.Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe$_2$[EB/OL].(2025-03-25)[2025-10-25].https://arxiv.org/abs/2503.19883.点此复制
We report the experimental observation of quadrupolar exciton states in the
reflectance contrast spectrum of 2$H$-stacked bilayer MoSe$_2$. The application
of a vertical electric field results in a quadratic energy redshift of these
quadrupolar excitons, in contrast to the linear energy splitting observed in
the coexisting dipolar excitons within the bilayer MoSe$_2$. We perform
helicity-resolved reflectance contrast measurements to investigate the spin and
valley configurations of the quadrupolar exciton states as a function of
applied vertical electric and magnetic fields. Comparing our results with a
phenomenological coupled-oscillator model indicates that the electric- and
magnetic-field dependence of the quadrupolar exciton states can be attributed
to the intravalley and intervalley hybridization of spin-triplet interlayer
excitons with opposite permanent dipole moments, mediated by interlayer hole
tunneling. These results position naturally stacked MoSe$_2$ bilayers as a
promising platform to explore electric-field-tunable many-body exciton
phenomena.
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