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Coherent, atomically thin transition-metal dichalcogenide superlattices with engineered strain

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Science  09 Mar 2018:
Vol. 359, Issue 6380, pp. 1131-1136
DOI: 10.1126/science.aao5360

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Coherent strained superlattices

Two-dimensional superlattices represent the atomic-thickness limit of heterostructures that enable technologies such as strain-engineered multiferroics and quantum-cascade lasers. Xie et al. were able to produce monolayer superlattices of transition metal dichalcogenides (WS2 and WSe2) with full lattice coherence, despite a 4% lattice mismatch. They used a modulated metal-organic chemical vapor deposition process that precisely controlled each precursor. Furthermore, the authors could strain-engineer the optical properties of the superlattices to observe out-of-plane rippling.

Science, this issue p. 1131