Evolution of inter-layer coupling in artificially stacked bilayer MoS2
| Autor: | Goutham Nayak, Laëtitia Marty, Nedjma Bendiab, Johann Coraux, Aveek Bid, Jaydeep Kumar Basu, Suman Sarkar, Vincent Bouchiat, Julien Renard, H. L. Pradeepa |
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| Přispěvatelé: | Indian Institute of Science, Systèmes hybrides de basse dimensionnalité (HYBRID), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Materials science Coupling strength Inter layer Bilayer General Engineering Bioengineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics 0104 chemical sciences Coupling (electronics) symbols.namesake symbols General Materials Science Emission spectrum [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 0210 nano-technology Raman spectroscopy Intensity (heat transfer) |
| Zdroj: | Nanoscale Advances Nanoscale Advances, RSC, 2019, 1 (11), pp.4398-4405. ⟨10.1039/c9na00517j⟩ |
| ISSN: | 2516-0230 |
| DOI: | 10.1039/c9na00517j |
| Popis: | International audience; In this paper, we show experimentally that for van der Waals heterostructures (vdWh) of atomically-thin materials, the hybridization of bands of adjacent layers is possible only for ultra-clean interfaces. This we achieve through a detailed experimental study of the effect of interfacial separation and adsorbate content on the photoluminescence emission and Raman spectra of ultra-thin vdWh. For vdWh with atomically-clean interfaces, we find the emergence of novel vibrational Raman-active modes whose optical signatures differ significantly from that of the constituent layers. Additionally, we find for such systems a significant modification of the photoluminescence emission spectra with the appearance of peaks whose strength and intensity directly correlate with the inter-layer coupling strength. Our ability to control the intensity of the photoluminescence emission led to the observation of detailed optical features like indirect-band peaks. Our study establishes that it is possible to engineer atomically-thin van der Waals heterostructures with desired optical properties by controlling the inter-layer spacing, and consequently the inter-layer coupling between the constituent layers. |
| Databáze: | OpenAIRE |
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