In low-temperature resonant Raman experiments on MoSe2-WSe2 heterobilayers, we identify a hybrid interlayer shear mode (HSM) with an energy, close to the interlayer shear mode (SM) of the heterobilayers, but with a much broader, asymmetric lineshape. The HSM shows a pronounced resonance with the intralayer hybrid trions (HX−) of the MoSe2 and WSe2 layers, only. No resonance with the neutral intralayer excitons is found. First-principles calculations reveal a strong coupling of Q-valley states, which are delocalized over both layers and participate in the HX−, with the SM. This emerging trion-phonon coupling may be relevant for experiments on gate-controlled heterobilayers.
@article{arxiv.2306.01483,
title = {Emergent Trion-Phonon Coupling in Atomically-Reconstructed MoSe$_2$-WSe$_2$ Heterobilayers},
author = {Sebastian Meier and Yaroslav Zhumagulov and Matthias Dietl and Philipp Parzefall and Michael Kempf and Johannes Holler and Philipp Nagler and Paulo E. Faria Junior and Jaroslav Fabian and Tobias Korn and Christian Schüller},
journal= {arXiv preprint arXiv:2306.01483},
year = {2023}
}