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Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el
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 (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.
