Efficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Ziliang Ye, Lutz Waldecker, Eric Yue, Daniel Rhodes, Abhinandan Antony, Bumho Kim, Xiao-Xiao Zhang, Minda Deng, Yuxuan Jiang, Zhengguang Lu, Dmitry Smirnov, Kenji Watanabe, Takashi Taniguchi, James Hone, Tony F. Heinz

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. More... »

PAGES

3718

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-018-05917-8

DOI

http://dx.doi.org/10.1038/s41467-018-05917-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1106858938

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30214026


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