Scientific article

Observation of flat Γ moiré bands in twisted bilayer WSe2

Published inPhysical review letters, vol. 131, no. 4, 046401
Publication date2023-07-25

The recent observation of correlated phases in transition metal dichalcogenide moir\'e systems at integer and fractional filling promises new insight into metal-insulator transitions and the unusual states of matter that can emerge near such transitions. Here, we combine real- and momentum-space mapping techniques to study moir\'e superlattice effects in 57.4$^{\circ}$ twisted WSe$_2$ (tWSe$_2$). Our data reveal a split-off flat band that derives from the monolayer $\Gamma$ states. Using advanced data analysis, we directly quantify the moir\'e potential from our data. We further demonstrate that the global valence band maximum in tWSe$_2$ is close in energy to this flat band but derives from the monolayer K-states which show weaker superlattice effects. These results constrain theoretical models and open the perspective that $\Gamma$-valley flat bands might be involved in the correlated physics of twisted WSe$_2$.

Citation (ISO format)
GATTI, Gianmarco et al. Observation of flat Γ moiré bands in twisted bilayer WSe<sub>2</sub>. In: Physical review letters, 2023, vol. 131, n° 4, p. 046401. doi: 10.1103/PhysRevLett.131.046401
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Article (Submitted version)
Article (Published version)
ISSN of the journal0031-9007

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