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In low-temperature resonant Raman experiments on MoSe$_2$-WSe$_2$heterobilayers, we identify a hybrid interlayer shear mode (HSM) with anenergy, close to the interlayer shear mode (SM) of the heterobilayers, but witha much broader, asymmetric lineshape. The HSM shows a pronounced resonance withthe intralayer hybrid trions (HX$^-$) of the MoSe$_2$ and WSe$_2$ layers, only.No resonance with the neutral intralayer excitons is found. First-principlescalculations reveal a strong coupling of Q-valley states, which are delocalizedover both layers and participate in the HX$^-$, with the SM. This emergingtrion-phonon coupling may be relevant for experiments on gate-controlledheterobilayers.

Emergent Trion-Phonon Coupling in Atomically-Reconstructed MoSe$_2$-WSe$_2$ Heterobilayers