期刊
NANO LETTERS
卷 13, 期 7, 页码 3329-3333出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl401561r
关键词
Molybdenum disulfide; hexagonal boron nitride; optical second-harmonic generation; symmetry; crystallographic orientation
类别
资金
- National Science Foundation [DMR-1124894]
- Department of Energy, Office of Basic Energy Sciences [DE-FG02-07ER15842, DE-SC0001085]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1124894] Funding Source: National Science Foundation
We have measured optical second-harmonic generation (SHG) from atomically thin samples of MoS2 and h-BN with one to five layers. We observe strong SHG from materials with odd layer thickness, for which a noncentrosymmetric structure is expected, while the centrosymmetric materials with even layer thickness do not yield appreciable SHG. SHG for materials with odd layer thickness was measured as a function of crystal orientation. This dependence reveals the rotational symmetry of the lattice and is shown to provide a purely optical method of determining the orientation of crystallographic axes. We report values for the nonlinearity of monolayers and odd-layers of MoS2 and h-BN and compare the variation as a function of layer thickness with a model that accounts for wave propagation effects.
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