Efficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers

Ziliang Ye, Lutz Waldecker, Eric Yue Ma, Daniel Rhodes, Abhinandan Antony, Bumho Kim, Xiao-Xiao Zhang, Minda Deng, Yuxuan Jiang, Zhengguang Lu, Dmitry Smirnov, Kenji Watanabe, Takashi Taniguchi, James Hone and Tony F. Heinz ()
Additional contact information
Ziliang Ye: Stanford University
Lutz Waldecker: Stanford University
Eric Yue Ma: Stanford University
Daniel Rhodes: Columbia University
Abhinandan Antony: Columbia University
Bumho Kim: Columbia University
Xiao-Xiao Zhang: Stanford University
Minda Deng: Stanford University
Yuxuan Jiang: National High Magnetic Field Laboratory
Zhengguang Lu: National High Magnetic Field Laboratory
Dmitry Smirnov: National High Magnetic Field Laboratory
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
James Hone: Columbia University
Tony F. Heinz: Stanford University

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-05917-8

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