Exciton–exciton annihilation and biexciton stimulated emission in graphene nanoribbons

Soavi, Giancarlo; Dal Conte, Stefano; Manzoni, Cristian; Viola, Daniele; Narita, Akimitsu; Hu, Yunbin; Feng, Xinliang; Hohenester, Ulrich; Molinari, Elisa; Prezzi, Deborah; Mullen, Klaus; Cerullo, Giulio

doi:10.1038/ncomms11010

Title: Exciton–exciton annihilation and biexciton stimulated emission in graphene nanoribbons

Journal Article · Thu Mar 17 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms11010· OSTI ID:1255251

Soavi, Giancarlo ^[1]; Dal Conte, Stefano ^[2]; Manzoni, Cristian ^[2]; Viola, Daniele ^[3]; Narita, Akimitsu ^[4]; Hu, Yunbin ^[4]; Feng, Xinliang ^[4]; Hohenester, Ulrich ^[5]; Molinari, Elisa ^[6]; Prezzi, Deborah ^[7]; Mullen, Klaus ^[4]; Cerullo, Giulio ^[8]

Politecnico di Milano, Milano (Italy); Univ. of Cambridge, Cambridge (United Kingdom)
Istituto di Fotonica e Nanotecnologie, Milano (Italy)
Politecnico di Milano, Milano (Italy)
Max Planck Institute for Polymer Research, Mainz (Germany)
Univ. of Graz, Graz (Austria)
Univ. di Modena e Reggio Emilia, Modena (Italy); Istituto Nanoscience, Modena (Italy)
Istituto Nanoscience, Modena (Italy)
Politecnico di Milano, Milano (Italy); Istituto di Fotonica e Nanotecnologie, Milano (Italy)

Graphene nanoribbons display extraordinary optical properties due to one-dimensional quantum-confinement, such as width-dependent bandgap and strong electron–hole interactions, responsible for the formation of excitons with extremely high binding energies. Here we use femtosecond transient absorption spectroscopy to explore the ultrafast optical properties of ultranarrow, structurally well-defined graphene nanoribbons as a function of the excitation fluence, and the impact of enhanced Coulomb interaction on their excited states dynamics. We show that in the high-excitation regime biexcitons are formed by nonlinear exciton–exciton annihilation, and that they radiatively recombine via stimulated emission. We obtain a biexciton binding energy of ≈250meV, in very good agreement with theoretical results from quantum Monte Carlo simulations. As a result, these observations pave the way for the application of graphene nanoribbons in photonics and optoelectronics.

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Research Organization:: Brookhaven Science Associates, LLC, Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1255251

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 74 works

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