Evolution of inter-layer coupling in artificially stacked bilayer MoS2

Sarkar, Suman ; Pradeepa, H. L. ; Nayak, Goutham ; Marty, Laetitia ; Renard, Julien ; Coraux, Johann ; Bendiab, Nedjma ; Bouchiat, Vincent ; Basu, Jaydeep K. ; Bid, Aveek (2019) Evolution of inter-layer coupling in artificially stacked bilayer MoS2 Nanoscale Advances, 1 (11). pp. 4398-4405. ISSN 2516-0230

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Official URL: http://doi.org/10.1039/C9NA00517J

Related URL: http://dx.doi.org/10.1039/C9NA00517J

Abstract

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:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:116023
Deposited On:22 Mar 2021 06:44
Last Modified:22 Mar 2021 06:44

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