Collective charge excitations between moiré-minibands in twisted WSe2 bilayers 
from resonant inelastic light scattering

Saigal, N.; Klebl, L.; Lambers, H.; Bahmanyar, S.; Antić, V.; Kennes, D. M.; Wehling, T. O.; Wurstbauer, U.

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Collective charge excitations between moiré-minibands in twisted WSe₂ bilayers from resonant inelastic light scattering

MPS-Authors

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Kennes, D. M.
nstitute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;

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https://arxiv.org/abs/2310.14417
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2310.14417.pdf
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引用

Saigal, N., Klebl, L., Lambers, H., Bahmanyar, S., Antić, V., Kennes, D. M., Wehling, T. O., & Wurstbauer, U. (2023). Collective charge excitations between moiré-minibands in twisted WSe₂ bilayers from resonant inelastic light scattering.

引用: https://hdl.handle.net/21.11116/0000-000D-D42F-0

要旨

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 (IMBE). We observe resonances in such RILS spectra at energies in agreement with inter-moiré band (IMB) transitions obtained from an ab-initio based continuum model. Transitions between the first and second IMB for a twist angle of about 8° are reported and between first and second, 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 to quantify the transition energies at the K-point where the states relevant for correlation physics are hosted.