期刊
NANO LETTERS
卷 13, 期 11, 页码 5361-5366出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl402875m
关键词
Molybdenum disulfide nanosheets; atomically thin crystal; strain engineering; exciton trapping; funnel effect; band structure
类别
资金
- European Union
- Dutch organization for Fundamental Research on Matter (FOM)
- FP7-Marie Curie Project [PIEF-GA-2011-300802, PIEF-GA-2009-251904]
- Juan de la Cierva Program (MINECO, Spain)
- MINECO (Spain) [FIS2011-23713]
- ERC [290846]
- European Research Council (ERC) [290846] Funding Source: European Research Council (ERC)
Controlling 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.
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