期刊
SCIENCE ADVANCES
卷 3, 期 1, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1601459
关键词
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资金
- Welch Foundation [F-1672]
- U.S. NSF [DMR-1306878, EFMA-1542747]
- King Abdullah University of Science and Technology (Saudi Arabia)
- Ministry of Science and Technology
- Taiwan Consortium of Emergent Crystalline Materials
- Academia Sinica (Taiwan)
- Asian Office of Aerospace Research and Development (USA) [FA23861510001]
- National Basic Research Program of China [2015CB921004, 2014CB932500]
- National Science Foundation of China [51472215, 51222202]
- Thematic Project at Academia Sinica
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1306878] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1542747] Funding Source: National Science Foundation
By using direct growth, we create a rotationally aligned MoS2/WSe2 hetero-bilayer as a designer van der Waals heterostructure. With rotational alignment, the lattice mismatch leads to a periodic variation of atomic registry between individual van der Waals layers, exhibiting a Moire pattern with a well-defined periodicity. By combining scanning tunneling microscopy/spectroscopy, transmission electronmicroscopy, and first-principles calculations, we investigate interlayer coupling as a function of atomic registry. We quantitatively determine the influence of interlayer coupling on the electronic structure of the hetero-bilayer at different critical points. We show that the direct gap semiconductor concept is retained in the bilayer although the valence and conduction band edges are located at different layers. We further show that the local bandgap is periodically modulated in the X-Y direction with an amplitude of similar to 0.15 eV, leading to the formation of a two-dimensional electronic superlattice.
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