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Evolution of inter-layer coupling in artificially stacked bilayer MoS2

Sarkar, S and Pradeepa, HL and Nayak, G and Marty, L and Renard, J and Coraux, J and Bendiab, N and Bouchiat, V and Basu, JK and Bid, A (2019) Evolution of inter-layer coupling in artificially stacked bilayer MoS2. In: Nanoscale Advances, 1 (11). pp. 4398-4405.

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Official URL: https://doi.org/10.1039/c9na00517j


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.

Item Type: Journal Article
Publication: Nanoscale Advances
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Emission spectroscopy; Layered semiconductors; Molybdenum compounds; Photoluminescence; Van der Waals forces, Adjacent layers; Coupling strengths; Interfacial separation; Optical features; Optical signatures; Photoluminescence emission; Photoluminescence emission spectra; Raman active modes, Optical properties
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Oct 2022 10:39
Last Modified: 25 Oct 2022 10:39
URI: https://eprints.iisc.ac.in/id/eprint/77567

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