Direct imaging and electronic structure modulation of moiré superlattices at the 2D/3D interface
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Open Access
- 26 February 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 12 (1), 1-9
- https://doi.org/10.1038/s41467-021-21363-5
Abstract
The atomic structure at the interface between two-dimensional (2D) and three-dimensional (3D) materials influences properties such as contact resistance, photo-response, and high-frequency electrical performance. Moiré engineering is yet to be utilized for tailoring this 2D/3D interface, despite its success in enabling correlated physics at 2D/2D interfaces. Using epitaxially aligned MoS2/Au{111} as a model system, we demonstrate the use of advanced scanning transmission electron microscopy (STEM) combined with a geometric convolution technique in imaging the crystallographic 32 Å moiré pattern at the 2D/3D interface. This moiré period is often hidden in conventional electron microscopy, where the Au structure is seen in projection. We show, via ab initio electronic structure calculations, that charge density is modulated according to the moiré period, illustrating the potential for (opto-)electronic moiré engineering at the 2D/3D interface. Our work presents a general pathway to directly image periodic modulation at interfaces using this combination of emerging microscopy techniques.Keywords
Funding Information
- MIT | Office of Graduate Education, Massachusetts Institute of Technology
- National Science Foundation (DMR-1905295, DMR-1905295, DMR - 1419807)
- United States Department of Defense | United States Navy | Office of Naval Research (N00014-18-1-2691, N00014-18-1-2691)
- Det Frie Forskningsråd (9035-00006B)
- Gordon and Betty Moore Foundation (GBMF8048)
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