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.
|
PDF
nan_sca_adv_ 1-11_4398 - 4405_2019.pdf - Published Version Download (1MB) | Preview |
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: | 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 |
Actions (login required)
 |
View Item |
