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Quadrupolar and Dipolar Excitons in Bilayer
Phys. Rev. Lett. 134, 166901 – Published 25 April, 2025
DOI: https://doi.org/10.1103/PhysRevLett.134.166901
Abstract
We report the experimental observation of quadrupolar exciton states in the reflectance contrast spectrum of -stacked bilayer . 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 . 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 intra- and intervalley hybridization of spin-triplet interlayer excitons with opposite permanent dipole moments, mediated by interlayer hole tunneling. These results position naturally stacked bilayers as a promising platform to explore electric-field-tunable many-body exciton phenomena.
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References (70)
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