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arXiv · 2306.01483

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

Sebastian Meier·Yaroslav Zhumagulov·Matthias Dietl·Philipp Parzefall·Michael Kempf·Johannes Holler·Philipp Nagler·Paulo E. Faria Junior·Jaroslav Fabian·Tobias Korn·Christian Schüller
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Abstract

In low-temperature resonant Raman experiments on MoSe$_2$-WSe$_2$ 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 MoSe$_2$ and WSe$_2$ 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.

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Sebastian Meier, Yaroslav Zhumagulov, Matthias Dietl, Philipp Parzefall, Michael Kempf, Johannes Holler, Philipp Nagler, Paulo E. Faria Junior, Jaroslav Fabian, Tobias Korn, Christian Schüller. 2023-06-02. Emergent Trion-Phonon Coupling in Atomically-Reconstructed MoSe$_2$-WSe$_2$ Heterobilayers. https://arxiv.org/abs/2306.01483

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