Interlayer Raman modes in twisted bilayer transition metal dichalcogenides

Schneider E, Watanabe K, Taniguchi T, Maultzsch J (2024)


Publication Type: Journal article

Publication year: 2024

Journal

Book Volume: 110

Article Number: 125431

Journal Issue: 12

DOI: 10.1103/PhysRevB.110.125431

Abstract

Twisted bilayer (2L) two-dimensional transition metal dichalgocenides (TMDCs) exhibit a range of novel phenomena such as the formation of moiré excitons and strongly correlated phases. The coupling between the layers is crucial for the resulting physical properties and depends not just on the twist angle but also on the details of the fabrication process. Here, we present an approach for the analysis of this interlayer coupling via Raman spectroscopy. By exciting the C-exciton resonance of the TMDCs, optical (high-frequency) interlayer Raman modes are activated that are too weak in intensity at excitation energies far below the C exciton. This is due to the wave function of the C exciton, which expands - in contrast to A and B excitons - over both layers and therefore couples the layers electronically. We present optical interlayer Raman modes in twisted 2L TMDCs and show that they can be used as a measure of the interlayer coupling between the individual layers.

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APA:

Schneider, E., Watanabe, K., Taniguchi, T., & Maultzsch, J. (2024). Interlayer Raman modes in twisted bilayer transition metal dichalcogenides. Physical Review B, 110(12). https://doi.org/10.1103/PhysRevB.110.125431

MLA:

Schneider, Eileen, et al. "Interlayer Raman modes in twisted bilayer transition metal dichalcogenides." Physical Review B 110.12 (2024).

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