2023/10/22 by Saigal, Nihit, Klebl, Lennart, Lambers, Hendrik +5
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)
paper · doi:10.48550/arxiv.2310.14417
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 intermoiré-band excitations (IMBE). 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 inter-moiré band 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.