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Hao K, Xu L, Nagler P, et al. Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2. Nano Lett. 2016;16(8):5109-13doi: 10.1021/acs.nanolett.6b02041.
Hao, K., Xu, L., Nagler, P., Singh, A., Tran, K., Dass, C. K., Schüller, C., Korn, T., Li, X., & Moody, G. (2016). Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2. Nano letters, 16(8), 5109-13. https://doi.org/10.1021/acs.nanolett.6b02041
Hao, Kai, et al. "Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2." Nano letters vol. 16,8 (2016): 5109-13. doi: https://doi.org/10.1021/acs.nanolett.6b02041
Hao K, Xu L, Nagler P, Singh A, Tran K, Dass CK, Schüller C, Korn T, Li X, Moody G. Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2. Nano Lett. 2016 Aug 10;16(8):5109-13. doi: 10.1021/acs.nanolett.6b02041. Epub 2016 Jul 22. PMID: 27428509; PMCID: PMC5593425.
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Nano Lett. 2016 Aug 10;16(8):5109-13. doi: 10.1021/acs.nanolett.6b02041. Epub 2016 Jul 22.

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

Nano letters

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

Affiliations

  1. Department of Physics and Center for Complex Quantum Systems, University of Texas at Austin , Austin, Texas 78712, United States.
  2. Department of Physics, University of Regensburg , Regensburg 93040, Germany.
  3. National Institute of Standards & Technology , Boulder, Colorado 80305, United States.

PMID: 27428509 PMCID: PMC5593425 DOI: 10.1021/acs.nanolett.6b02041

Abstract

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. 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.

Keywords: Quantum beats; coherent coupling; exciton; trion; two-dimensional materials

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