Observation of biexcitons in monolayer WSe2 View Full Text


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Article Info

DATE

2015-06

AUTHORS

Yumeng You, Xiao-Xiao Zhang, Timothy C. Berkelbach, Mark S. Hybertsen, David R. Reichman, Tony F. Heinz

ABSTRACT

Transition metal dichalcogenide (TMDC) crystals exhibit new emergent properties at monolayer thickness1,2, notably strong many-body effects mediated by Coulomb interactions3,4,5,6. A manifestation of these many-body interactions is the formation of excitons, bound electron–hole pairs, but higher-order excitonic states are also possible. Here we demonstrate the existence of four-body, biexciton states in monolayer WSe2. The biexciton is identified as a sharply defined state in photoluminescence at high exciton density. Its binding energy of 52 meV is more than an order of magnitude greater than that found in conventional quantum-well structures7. A variational calculation of the biexciton state reveals that the high binding energy arises not only from strong carrier confinement, but also from reduced and non-local dielectric screening. These results open the way for the creation of new correlated excitonic states linking the degenerate valleys in TMDC crystals, as well as more complex many-body states such as exciton condensates or the recently reported dropletons8. More... »

PAGES

477

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nphys3324

DOI

http://dx.doi.org/10.1038/nphys3324

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037682572


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