Lin, Kai-Qiang and Holler, Johannes and Bauer, Jonas M. and Parzefall, Philipp and Scheuck, Marten and Peng, Bo and Korn, Tobias and Bange, Sebastian and Lupton, John M. and Schüller, Christian (2021) Large-Scale Mapping of Moire Superlattices by Hyperspectral Raman Imaging. ADVANCED MATERIALS, 33 (34): 2008333. ISSN 0935-9648, 1521-4095
Full text not available from this repository. (Request a copy)Abstract
Moire superlattices can induce correlated-electronic phases in twisted van der Waals materials: strongly correlated quantum phenomena emerge, such as superconductivity and the Mott-insulating state. However, moire superlattices produced through artificial stacking can be quite inhomogeneous, which hampers the development of a clear correlation between the moire period and the emerging electrical and optical properties. Here, it is demonstrated in twisted-bilayer transition-metal dichalcogenides that low-frequency Raman scattering can be utilized not only to detect atomic reconstruction, but also to map out the inhomogeneity of the moire lattice over large areas. The method is established based on the finding that both the interlayer-breathing mode and moire phonons are highly susceptible to the moire period and provide characteristic fingerprints. Hyperspectral Raman imaging visualizes microscopic domains of a 5 degrees twisted-bilayer sample with an effective twist-angle resolution of about 0.1 degrees. This ambient methodology can be conveniently implemented to characterize and preselect high-quality areas of samples for subsequent device fabrication, and for transport and optical experiments.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GRAPHENE; MULTILAYER; MODES; SHEAR; SCATTERING; INTERFACE; MOS2; hyperspectral Raman imaging; interlayer breathing modes; low-frequency Raman scattering; moire phonons; moire superlattices |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Aug 2022 10:41 |
| Last Modified: | 10 Aug 2022 10:41 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46415 |
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