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Evolution of inter-layer coupling in artificially stacked bilayer MoS2

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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.

Graphical abstract: Evolution of inter-layer coupling in artificially stacked bilayer MoS2

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Publication details

The article was received on 19 Aug 2019, accepted on 22 Sep 2019 and first published on 02 Oct 2019


Article type: Paper
DOI: 10.1039/C9NA00517J
Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Evolution of inter-layer coupling in artificially stacked bilayer MoS2

    S. Sarkar, H. L. Pradeepa, G. Nayak, L. Marty, J. Renard, J. Coraux, N. Bendiab, V. Bouchiat, J. K. Basu and A. Bid, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C9NA00517J

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