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Excitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4.

Monolayer transition metal dichalcogenides (TMDs) possess superior optical properties, including the valley degree of freedom that can be accessed through the excitation light of certain helicity. Although WS2 and WSe2 are known for their excellent valley polarization due to the strong spin–orbit co... Full description

Journal Title: Nano letters January 9, 2019, Vol.19(1), pp.299-307
Main Author: Meng, Yuze
Other Authors: Wang, Tianmeng , Li, Zhipeng , Qin, Ying , Lian, Zhen , Chen, Yanwen , Lucking, Michael C , Beach, Kory , Taniguchi, Takashi , Watanabe, Kenji , Tongay, Sefaattin , Song, Fengqi , Terrones, Humberto , Shi, Su-Fei
Format: Electronic Article Electronic Article
Language: English
Subjects:
Ws2
ID: E-ISSN: 1530-6992 ; DOI: 1530-6992 ; DOI: 10.1021/acs.nanolett.8b03918
Link: http://search.proquest.com/docview/2157675668/?pq-origsite=primo
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title: Excitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4.
format: Article
creator:
  • Meng, Yuze
  • Wang, Tianmeng
  • Li, Zhipeng
  • Qin, Ying
  • Lian, Zhen
  • Chen, Yanwen
  • Lucking, Michael C
  • Beach, Kory
  • Taniguchi, Takashi
  • Watanabe, Kenji
  • Tongay, Sefaattin
  • Song, Fengqi
  • Terrones, Humberto
  • Shi, Su-Fei
subjects:
  • 2s Exciton
  • Ws2
  • Wse2
  • Alloy
  • Resonance Raman Peak
  • Valley Polarization
ispartof: Nano letters, January 9, 2019, Vol.19(1), pp.299-307
description: Monolayer transition metal dichalcogenides (TMDs) possess superior optical properties, including the valley degree of freedom that can be accessed through the excitation light of certain helicity. Although WS2 and WSe2 are known for their excellent valley polarization due to the strong spin–orbit coupling, the optical bandgap is limited by the ability to choose from only these two materials. This limitation can be overcome through the monolayer alloy semiconductor, WS2xSe2(1–x), which promises an atomically thin semiconductor with tunable bandgap. In this work, we show that the high-quality BN encapsulated monolayer WS0.6Se1.4 inherits the superior optical properties of tungsten-based TMDs, including a trion splitting of ∼6 meV and valley polarization as high as ∼60%. In particular, we demonstrate for the first time the emerging and gate-tunable interlayer electron–phonon coupling in the BN/WS0.6Se1.4/BN van der Waals heterostructure, which renders the otherwise optically silent Raman modes visible. In addition, the emerging Raman signals can be drastically enhanced by the resonant coupling to the 2s state of the monolayer WS0.6Se1.4 A exciton. The BN/WS2xSe2(1–x)/BN van der Waals heterostructure with a tunable bandgap thus provides an exciting platform for exploring the valley degree of freedom and emerging excitonic physics in two-dimension.
language: eng
source:
identifier: E-ISSN: 1530-6992 ; DOI: 1530-6992 ; DOI: 10.1021/acs.nanolett.8b03918
fulltext: fulltext
issn:
  • 15306992
  • 1530-6992
url: Link


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titleExcitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4.
creatorMeng, Yuze ; Wang, Tianmeng ; Li, Zhipeng ; Qin, Ying ; Lian, Zhen ; Chen, Yanwen ; Lucking, Michael C ; Beach, Kory ; Taniguchi, Takashi ; Watanabe, Kenji ; Tongay, Sefaattin ; Song, Fengqi ; Terrones, Humberto ; Shi, Su-Fei
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ispartofNano letters, January 9, 2019, Vol.19(1), pp.299-307
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subject2s Exciton ; Ws2 ; Wse2 ; Alloy ; Resonance Raman Peak ; Valley Polarization
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descriptionMonolayer transition metal dichalcogenides (TMDs) possess superior optical properties, including the valley degree of freedom that can be accessed through the excitation light of certain helicity. Although WS2 and WSe2 are known for their excellent valley polarization due to the strong spin–orbit coupling, the optical bandgap is limited by the ability to choose from only these two materials. This limitation can be overcome through the monolayer alloy semiconductor, WS2xSe2(1–x), which promises an atomically thin semiconductor with tunable bandgap. In this work, we show that the high-quality BN encapsulated monolayer WS0.6Se1.4 inherits the superior optical properties of tungsten-based TMDs, including a trion splitting of ∼6 meV and valley polarization as high as ∼60%. In particular, we demonstrate for the first time the emerging and gate-tunable interlayer electron–phonon coupling in the BN/WS0.6Se1.4/BN van der Waals heterostructure, which renders the otherwise optically silent Raman modes visible. In addition, the emerging Raman signals can be drastically enhanced by the resonant coupling to the 2s state of the monolayer WS0.6Se1.4 A exciton. The BN/WS2xSe2(1–x)/BN van der Waals heterostructure with a tunable bandgap thus provides an exciting platform for exploring the valley degree of freedom and emerging excitonic physics in two-dimension.
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titleExcitonic Complexes and Emerging Interlayer Electron-Phonon Coupling in BN Encapsulated Monolayer Semiconductor Alloy: WS0.6Se1.4.
authorMeng, Yuze ; Wang, Tianmeng ; Li, Zhipeng ; Qin, Ying ; Lian, Zhen ; Chen, Yanwen ; Lucking, Michael C ; Beach, Kory ; Taniguchi, Takashi ; Watanabe, Kenji ; Tongay, Sefaattin ; Song, Fengqi ; Terrones, Humberto ; Shi, Su-Fei
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