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Journal Article

Collective Charge Excitations between Moiré Minibands in Twisted WSe2 Bilayers Probed with Resonant Inelastic Light Scattering

MPS-Authors
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Kennes,  D. M.
Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA ;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;

External Resource

https://arxiv.org/abs/2310.14417
(Preprint)

https://doi.org/10.1103/PhysRevLett.133.046902
(Publisher version)

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Fulltext (public)

2310.14417.pdf
(Preprint), 5MB

Supplementary Material (public)

2024_Saigal_etal_RILS-revised_SI.pdf
(Supplementary material), 5MB

Citation

Saigal, N., Klebl, L., Lambers, H., Bahmanyar, S., Antić, V., Kennes, D. M., et al. (2024). Collective Charge Excitations between Moiré Minibands in Twisted WSe2 Bilayers Probed with Resonant Inelastic Light Scattering. Physical Review Letters, 133(4): 046902. doi:10.1103/PhysRevLett.133.046902.


Cite as: https://hdl.handle.net/21.11116/0000-000D-D42F-0
Abstract
We establish low-temperature resonant inelastic light scattering (RILS) spectroscopy as a tool to probe the formation of a series of moiré bands in twisted WSe2 bilayers by accessing collective inter-moiré-band excitations (IMBEs). We observe resonances in RILS spectra at energies in agreement with inter-moiré-band transitions obtained from an ab initio based continuum model. Transitions between the first and second moiré band for a twist angle of about 8° are reported and between the first and the third, and higher bands for a twist of about 3°. The signatures from IMBE for the latter highlight a strong departure from parabolic bands with flat minibands exhibiting very high density of states in accord with theory. These observations allow one to quantify the transition energies at the K point where the states relevant for correlation physics are hosted.