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Local strain engineering in atomically thin MoS2

AuthorsCastellanos-Gómez, Andrés ; Roldán, Rafael ; Cappelluti, E. ; Buscema, M.; Guinea, F. ; Zant, Herre S. J. van der; Steele, Gary A.
KeywordsBand structure
Funnel effect
Exciton trapping
Strain engineering
Atomically thin crystal
Molybdenum disulfide nanosheets
Issue Date2013
PublisherAmerican Chemical Society
CitationNano Letters 13(11): 5361-5366 (2013)
AbstractControlling the bandstructure through local-strain engineering is an exciting avenue for tailoring optoelectronic properties of materials at the nanoscale. Atomically thin materials are particularly well-suited for this purpose because they can withstand extreme nonhomogeneous deformations before rupture. Here, we study the effect of large localized strain in the electronic bandstructure of atomically thin MoS2. Using photoluminescence imaging, we observe a strain-induced reduction of the direct bandgap and funneling of photogenerated excitons toward regions of higher strain. To understand these results, we develop a nonuniform tight-binding model to calculate the electronic properties of MoS2 nanolayers with complex and realistic local strain geometries, finding good agreement with our experimental results. © 2013 American Chemical Society.
Publisher version (URL)http://dx.doi.org/10.1021/nl402875m
Identifiersdoi: 10.1021/nl402875m
issn: 1530-6984
e-issn: 1530-6992
Appears in Collections:(ICMM) Artículos
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