Optical spectroscopy of interlayer coupling in artificially stacked MoS sub(2) layers

We perform an optical spectroscopy study to investigate the properties of different artificial MoS sub(2) bi- and trilayer stacks created from individual monolayers by a deterministic transfer process. These twisted bi- and trilayers differ from the common 2H stacking in mineral MoS sub(2) in the re...

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Bibliographic Details
Published in:2d materials 2015-09, Vol.2 (3)
Main Authors: Plechinger, G, Mooshammer, F, Castellanos-Gomez, A, Steele, G A, Schuller, C, Korn, T
Format: Article
Language:English
Subjects:
Constituents
Interlayers
Joining
Molybdenum disulfide
Monolayers
Spectroscopy
Stacking
Valleys
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Summary:We perform an optical spectroscopy study to investigate the properties of different artificial MoS sub(2) bi- and trilayer stacks created from individual monolayers by a deterministic transfer process. These twisted bi- and trilayers differ from the common 2H stacking in mineral MoS sub(2) in the relative stacking angle of adjacent layers and the interlayer distance. The combination of Raman spectroscopy, second-harmonic-generation microscopy and photoluminescence measurements allows us to determine the degree of interlayer coupling in our samples. We find that even for electronically decoupled artificial structures, which show the same valley polarization degree as the constituent MoS sub(2) monolayers at low temperatures, there is a resonant energy transfer between individual layers which acts as an effective luminescence quenching mechanism.
ISSN:2053-1583
2053-1583
DOI:10.1088/2053-1583/2/3/034016