Speaker
Gianmarco Gatti
(DQMP, University of Geneva)
Description
Recent transport experiments revealed a correlated insulating phase and quantum criticality points in twisted transition metal dichalcogenides (TMDs) that were predicted to host non-dispersive Moiré mini-bands. Here, we report for the first time on the direct observation of flat bands in twisted TMDs investigating 57° twisted bilayer WSe$_2$ by micro-focused angle-resolved photoemission spectroscopy. We resolve multiple Moiré mini-bands with strongly reduced dispersion and significant mini-gaps. By comparison with effective continuum band structure models, we attribute the origin of the flat states to a moderate Moiré potential of ≈ 50 meV emerging from the stacking of the two semiconducting layers.
Author
Gianmarco Gatti
(DQMP, University of Geneva)
Co-authors
Ms
Julia Issing
(DQMP, University of Geneva)
Mr
Florian Margot
(DQMP, University of Geneva)
Mrs
Anna Tamai
(DQMP, University of Geneva)
Mr
Louk Rademaker
(DQMP, University of Geneva)
Felix Baumberger
(DQMP, University of Geneva)
