Optically Discriminating Carrier-Induced Quasiparticle Band Gap and Exciton Energy Renormalization in Monolayer MoS2

Kaiyuan Yao, Aiming Yan, Salman Kahn, Aslihan Suslu, Yufeng Liang, Edward S. Barnard, Sefaattin Tongay, Alex Zettl, Nicholas J. Borys, P. James Schuck

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Optoelectronic excitations in monolayer MoS2 manifest from a hierarchy of electrically tunable, Coulombic free-carrier and excitonic many-body phenomena. Investigating the fundamental interactions underpinning these phenomena - critical to both many-body physics exploration and device applications - presents challenges, however, due to a complex balance of competing optoelectronic effects and interdependent properties. Here, optical detection of bound- and free-carrier photoexcitations is used to directly quantify carrier-induced changes of the quasiparticle band gap and exciton binding energies. The results explicitly disentangle the competing effects and highlight longstanding theoretical predictions of large carrier-induced band gap and exciton renormalization in two-dimensional semiconductors.

Original languageEnglish (US)
Article number087401
JournalPhysical Review Letters
Volume119
Issue number8
DOIs
StatePublished - Aug 25 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yao, K., Yan, A., Kahn, S., Suslu, A., Liang, Y., Barnard, E. S., Tongay, S., Zettl, A., Borys, N. J., & Schuck, P. J. (2017). Optically Discriminating Carrier-Induced Quasiparticle Band Gap and Exciton Energy Renormalization in Monolayer MoS2. Physical Review Letters, 119(8), [087401]. https://doi.org/10.1103/PhysRevLett.119.087401