Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2

Hao, Kai; Xu, Lixiang; Nagler, Philipp; Singh, Akshay; Tran, Kha; Dass, Chandriker Kavir; Schüller, Christian; Korn, Tobias; Li, Xiaoqin; Moody, Galan

doi:10.1021/acs.nanolett.6b02041

Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe₂

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.6b02041· OSTI ID:1388923

Hao, Kai ^[1]; Xu, Lixiang ^[1]; Nagler, Philipp ^[2]; Singh, Akshay ^[1]; Tran, Kha ^[1]; Dass, Chandriker Kavir ^[1]; Schüller, Christian ^[2]; Korn, Tobias ^[2]; Li, Xiaoqin ^[1]; Moody, Galan ^[3]

Univ. of Texas, Austin, TX (United States). Dept. of Physics and Center for Complex Quantum Systems
Univ. of Regensburg (Germany). Dept. of Physics
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)

The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron–hole pairs) and charged excitons (trions) that are stable even at room temperature. While trions directly influence charge transport properties in optoelectronic devices, excitons may be relevant through exciton–trion coupling and conversion phenomena. Here in this work, we reveal the coherent and incoherent nature of exciton–trion coupling and the relevant time scales in monolayer MoSe₂ using optical two-dimensional coherent spectroscopy. Coherent interaction between excitons and trions is definitively identified as quantum beating of cross peaks in the spectra that persists for a few hundred femtoseconds. For longer times up to 10 ps, surprisingly, the relative intensity of the cross peaks increases, which is attributed to incoherent energy transfer likely due to phonon-assisted up-conversion and down-conversion processes that are efficient even at cryogenic temperature.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012670

OSTI ID:: 1388923

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 8 Vol. 16; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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