Evidence of the direct-to-indirect band gap transition in strained two-dimensional WS2, MoS2, and WSe2

E. Blundo; M. Felici; T. Yildirim; G. Pettinari; D. Tedeschi; A. Miriametro; B. Liu; W. Ma; Y. Lu; A. Polimeni

doi:10.1103/PhysRevResearch.2.012024

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Evidence of the direct-to-indirect band gap transition in strained two-dimensional WS2, MoS2, and WSe2

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Evidence of the direct-to-indirect band gap transition in strained two-dimensional WS2, MoS2, and WSe2

E. Blundo, M. Felici, T. Yildirim, G. Pettinari, D. Tedeschi, A. Miriametro, B. Liu, W. Ma, Y. Lu and A. Polimeni

Physical review research, Vol.2, 012024

23/01/2020

DOI: https://doi.org/10.1103/PhysRevResearch.2.012024

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Abstract

Electronic structure

Excitions

Strain

Hydrogenated materials

Transition metal dichalcogenides

Atomic force microscopy

Photoluminescence

We report a strain-induced direct-to-indirect band gap transition in mechanically deformed WS2 monolayers (MLs). The necessary amount of strain is attained by proton irradiation of bulk WS2 and the ensuing formation of 1-ML-thick, H-2-filled domes. The electronic properties of the curved MLs are mapped by spatially and time-resolved microphotoluminescence, revealing the mechanical stress conditions that trigger the variation of the band gap character. This general phenomenon, also observed in MoS2 and WSe2, further increases our understanding of the electronic structure of transition metal dichalcogenide MLs and holds a great relevance for their optoelectronic applications.

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Title: Evidence of the direct-to-indirect band gap transition in strained two-dimensional WS2, MoS2, and WSe2
Creators: E. Blundo - Sapienza University of Rome
M. Felici - Sapienza University of Rome
T. Yildirim - Australian National University
G. Pettinari - Institute for Photonics and Nanotechnologies, National Research Council (Rome, Italy)
D. Tedeschi - Sapienza University of Rome
A. Miriametro - Sapienza University of Rome
B. Liu - Australian National University
W. Ma - Australian National University
Y. Lu - Australian National University
A. Polimeni - Sapienza University of Rome
Publication Details: Physical review research, Vol.2, 012024
Publisher: American Physical Society
Number of pages: 7
Grant note: RBFR12RS1W / Italian Ministry for Education, University and Research within the Futuro in Ricerca (FIRB) program (project DeLIGHTeD); Ministry of Education, Universities and Research (MIUR); Fund for Investment in Basic Research (FIRB) Sapienza Universita di Roma under the grants "Ricerche Ateneo" CE170100039 / ARC Centre of Excellence in Future Low-Energy Electronics Technologies; Australian Research Council DE140100805; DP180103238 / Australian Research Council (ARC); Australian Research Council 641899 / European Union's Horizon 2020 research and innovation Program
Identifiers: 991013160982202368
Copyright: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.
Academic Unit: Faculty of Science and Engineering
Language: English
Resource Type: Journal article

Evidence of the direct-to-indirect band gap transition in strained two-dimensional WS2, MoS2, and WSe2

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