Flat bands in long moiré wavelength twisted bilayer WSe2

dc.creatorZhang, Zhiming
dc.creatorWang, Yimeng
dc.creatorWatanabe, Kenji
dc.creatorTaniguchi, Takashi
dc.creatorUeno, Kenji
dc.creatorTutuc, Emanuel
dc.creatorLeRoy, Brain J.
dc.date.accessioned2024-01-24T17:39:01Z
dc.date.available2024-01-24T17:39:01Z
dc.date.issued2019-10-29
dc.description.abstractThe crystal structure of a material creates a periodic potential that electrons move through giving rise to the electronic band structure of the material. When two-dimensional materials are stacked, the twist angle between the layers becomes an additional degree freedom for the resulting heterostructure. As this angle changes, the electronic band structure is modified leading to the possibility of flat bands with localized states and enhanced electronic correlations 1–6. In transition metal dichalcogenides, flat bands have been theoretically predicted to occur for long moiré wavelengths over a range of twist angles around 0 and 60 degrees 4 giving much wider versatility than magic angle twisted bilayer graphene. Here we show the existence of a flat band in the electronic structure of 3° and 57.5° twisted bilayer WSe2 samples using scanning tunneling spectroscopy. Direct spatial mapping of wavefunctions at the flat band energy have shown that the flat bands are localized differently for 3° and 57.5°, in excellent agreement with first-principle density functional theory calculations.
dc.description.departmentCenter for Dynamics and Control of Materials
dc.identifier.doihttps://doi.org/10.48550/arXiv.1910.13068
dc.identifier.urihttps://hdl.handle.net/2152/123494
dc.identifier.urihttps://doi.org/10.26153/tsw/50290
dc.language.isoen_US
dc.relation.ispartofCenter for Dynamics and Control of Materials Publications
dc.rights.restrictionOpen
dc.subjectflat bands
dc.titleFlat bands in long moiré wavelength twisted bilayer WSe2
dc.typeArticle

Access full-text files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
1910.13068 (1).pdf
Size:
2.25 MB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.64 KB
Format:
Item-specific license agreed upon to submission
Description: