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Efficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers

Higher-order correlated excitonic states arise from the mutual interactions of excitons, which generally requires a significant exciton density and therefore high excitation levels. Here, we report the emergence of two biexcitons species, one neutral and one charged, in monolayer tungsten diselenide... Full description

Journal Title: Nature Communications Sep 2018, Vol.9, pp.1-6
Main Author: Ye, Ziliang
Other Authors: Waldecker, Lutz , Yue, Eric , Rhodes, Daniel , Kim, Bumho , Xiao-Xiao, Zhang , Deng, Minda , Jiang, Yuxuan , Lu, Zhengguang , Smirnov, Dmitry , Watanabe, Kenji , Taniguchi, Takashi , Hone, James , Heinz, Tony
Format: Electronic Article Electronic Article
Language: English
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ID: E-ISSN: 20411723 ; DOI: 10.1038/s41467-018-05917-8
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title: Efficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers
format: Article
creator:
  • Ye, Ziliang
  • Waldecker, Lutz
  • Yue, Eric
  • Rhodes, Daniel
  • Kim, Bumho
  • Xiao-Xiao, Zhang
  • Deng, Minda
  • Jiang, Yuxuan
  • Lu, Zhengguang
  • Smirnov, Dmitry
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Hone, James
  • Heinz, Tony
subjects:
  • Encapsulation
  • Boron
  • Luminous Intensity
  • Selenides
  • Boron
  • Tungsten
  • Magnetic Fields
  • Tungsten Compounds
  • Tungsten
  • Boron Nitride
  • Monolayers
  • Wave Excitation
  • Dependence
  • Continuous Radiation
  • Excitons
ispartof: Nature Communications, Sep 2018, Vol.9, pp.1-6
description: Higher-order correlated excitonic states arise from the mutual interactions of excitons, which generally requires a significant exciton density and therefore high excitation levels. Here, we report the emergence of two biexcitons species, one neutral and one charged, in monolayer tungsten diselenide under moderate continuous-wave excitation. The efficient formation of biexcitons is facilitated by the long lifetime of the dark exciton state associated with a spin-forbidden transition, as well as improved sample quality from encapsulation between hexagonal boron nitride layers. From studies of the polarization and magnetic field dependence of the neutral biexciton, we conclude that this species is composed of a bright and a dark excitons residing in opposite valleys in momentum space. Our observations demonstrate that the distinctive features associated with biexciton states can be accessed at low light intensities and excitation densities.
language: eng
source:
identifier: E-ISSN: 20411723 ; DOI: 10.1038/s41467-018-05917-8
fulltext: fulltext_linktorsrc
issn:
  • 20411723
  • 2041-1723
url: Link


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titleEfficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers
creatorYe, Ziliang ; Waldecker, Lutz ; Yue, Eric ; Rhodes, Daniel ; Kim, Bumho ; Xiao-Xiao, Zhang ; Deng, Minda ; Jiang, Yuxuan ; Lu, Zhengguang ; Smirnov, Dmitry ; Watanabe, Kenji ; Taniguchi, Takashi ; Hone, James ; Heinz, Tony
ispartofNature Communications, Sep 2018, Vol.9, pp.1-6
identifierE-ISSN: 20411723 ; DOI: 10.1038/s41467-018-05917-8
subjectEncapsulation ; Boron ; Luminous Intensity ; Selenides ; Boron ; Tungsten ; Magnetic Fields ; Tungsten Compounds ; Tungsten ; Boron Nitride ; Monolayers ; Wave Excitation ; Dependence ; Continuous Radiation ; Excitons
descriptionHigher-order correlated excitonic states arise from the mutual interactions of excitons, which generally requires a significant exciton density and therefore high excitation levels. Here, we report the emergence of two biexcitons species, one neutral and one charged, in monolayer tungsten diselenide under moderate continuous-wave excitation. The efficient formation of biexcitons is facilitated by the long lifetime of the dark exciton state associated with a spin-forbidden transition, as well as improved sample quality from encapsulation between hexagonal boron nitride layers. From studies of the polarization and magnetic field dependence of the neutral biexciton, we conclude that this species is composed of a bright and a dark excitons residing in opposite valleys in momentum space. Our observations demonstrate that the distinctive features associated with biexciton states can be accessed at low light intensities and excitation densities.
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titleEfficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers
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authorYe, Ziliang ; Waldecker, Lutz ; Yue, Eric ; Rhodes, Daniel ; Kim, Bumho ; Xiao-Xiao, Zhang ; Deng, Minda ; Jiang, Yuxuan ; Lu, Zhengguang ; Smirnov, Dmitry ; Watanabe, Kenji ; Taniguchi, Takashi ; Hone, James ; Heinz, Tony
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abstractHigher-order correlated excitonic states arise from the mutual interactions of excitons, which generally requires a significant exciton density and therefore high excitation levels. Here, we report the emergence of two biexcitons species, one neutral and one charged, in monolayer tungsten diselenide under moderate continuous-wave excitation. The efficient formation of biexcitons is facilitated by the long lifetime of the dark exciton state associated with a spin-forbidden transition, as well as improved sample quality from encapsulation between hexagonal boron nitride layers. From studies of the polarization and magnetic field dependence of the neutral biexciton, we conclude that this species is composed of a bright and a dark excitons residing in opposite valleys in momentum space. Our observations demonstrate that the distinctive features associated with biexciton states can be accessed at low light intensities and excitation densities.
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