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Superior valley polarization and coherence of 2s excitons in monolayer WSe2

We report experimental observation of 2s exciton radiative emission from monolayer tungsten diselenide, enabled by hexagonal boron nitride protected high-quality samples. The 2s luminescence is highly robust and persists up to 150K, offering a new quantum entity for manipulating the valley degree of... Full description

Journal Title: arXiv.org Dec 8, 2017
Main Author: Shao-Yu, Chen
Other Authors: Goldstein, Thomas , Tong, Jiayue , Taniguchi, Takashi , Watanabe, Kenji , Yan, Jun
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: DOI: 10.1103/PhysRevLett.120.046402
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recordid: proquest2071289599
title: Superior valley polarization and coherence of 2s excitons in monolayer WSe2
format: Article
creator:
  • Shao-Yu, Chen
  • Goldstein, Thomas
  • Tong, Jiayue
  • Taniguchi, Takashi
  • Watanabe, Kenji
  • Yan, Jun
subjects:
  • Depolarization
  • Tungsten Compounds
  • Polarization
  • Boron Nitride
  • Selenides
  • Monolayers
  • Coherence
  • Excitons
  • Transition Metal Compounds
ispartof: arXiv.org, Dec 8, 2017
description: We report experimental observation of 2s exciton radiative emission from monolayer tungsten diselenide, enabled by hexagonal boron nitride protected high-quality samples. The 2s luminescence is highly robust and persists up to 150K, offering a new quantum entity for manipulating the valley degree of freedom. Remarkably, the 2s exciton displays superior valley polarization and coherence than 1s under similar experimental conditions. This observation provides evidence that the Coulomb-exchange-interaction-driven valley-depolarization process, the Maialle-Silva-Sham mechanism, plays an important role in valley excitons of monolayer transition metal dichalcogenides.
language: eng
source:
identifier: DOI: 10.1103/PhysRevLett.120.046402
fulltext: fulltext_linktorsrc
url: Link


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titleSuperior valley polarization and coherence of 2s excitons in monolayer WSe2
creatorShao-Yu, Chen ; Goldstein, Thomas ; Tong, Jiayue ; Taniguchi, Takashi ; Watanabe, Kenji ; Yan, Jun
contributorYan, Jun (pacrepositoryorg)
ispartofarXiv.org, Dec 8, 2017
identifierDOI: 10.1103/PhysRevLett.120.046402
subjectDepolarization ; Tungsten Compounds ; Polarization ; Boron Nitride ; Selenides ; Monolayers ; Coherence ; Excitons ; Transition Metal Compounds
descriptionWe report experimental observation of 2s exciton radiative emission from monolayer tungsten diselenide, enabled by hexagonal boron nitride protected high-quality samples. The 2s luminescence is highly robust and persists up to 150K, offering a new quantum entity for manipulating the valley degree of freedom. Remarkably, the 2s exciton displays superior valley polarization and coherence than 1s under similar experimental conditions. This observation provides evidence that the Coulomb-exchange-interaction-driven valley-depolarization process, the Maialle-Silva-Sham mechanism, plays an important role in valley excitons of monolayer transition metal dichalcogenides.
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descriptionWe report experimental observation of 2s exciton radiative emission from monolayer tungsten diselenide, enabled by hexagonal boron nitride protected high-quality samples. The 2s luminescence is highly robust and persists up to 150K, offering a new quantum entity for manipulating the valley degree of freedom. Remarkably, the 2s exciton displays superior valley polarization and coherence than 1s under similar experimental conditions. This observation provides evidence that the Coulomb-exchange-interaction-driven valley-depolarization process, the Maialle-Silva-Sham mechanism, plays an important role in valley excitons of monolayer transition metal dichalcogenides.
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abstractWe report experimental observation of 2s exciton radiative emission from monolayer tungsten diselenide, enabled by hexagonal boron nitride protected high-quality samples. The 2s luminescence is highly robust and persists up to 150K, offering a new quantum entity for manipulating the valley degree of freedom. Remarkably, the 2s exciton displays superior valley polarization and coherence than 1s under similar experimental conditions. This observation provides evidence that the Coulomb-exchange-interaction-driven valley-depolarization process, the Maialle-Silva-Sham mechanism, plays an important role in valley excitons of monolayer transition metal dichalcogenides.
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pubCornell University Library, arXiv.org
doi10.1103/PhysRevLett.120.046402
urlhttp://search.proquest.com/docview/2071289599/
pages046402
volume120
issue4
eissn10797114
issn00319007
oafree_for_read
date2017-12-08