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Issue 35, 2020
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Neutral and charged dark excitons in monolayer WS2

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Low temperature and polarization resolved magneto-photoluminescence experiments are used to investigate the properties of dark excitons and dark trions in a monolayer of WS2 encapsulated in hexagonal BN (hBN). We find that this system is an n-type doped semiconductor and that dark trions dominate the emission spectrum. In line with previous studies on WSe2, we identify the Coulomb exchange interaction coupled neutral dark and grey excitons through their polarization properties, while an analogous effect is not observed for dark trions. Applying the magnetic field in both perpendicular and parallel configurations with respect to the monolayer plane, we determine the g-factor of dark trions to be g ∼ −8.6. Their decay rate is close to 0.5 ns, more than 2 orders of magnitude longer than that of bright excitons.

Graphical abstract: Neutral and charged dark excitons in monolayer WS2

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Article information

03 Jun 2020
19 Aug 2020
First published
21 Aug 2020

Nanoscale, 2020,12, 18153-18159
Article type

Neutral and charged dark excitons in monolayer WS2

M. Zinkiewicz, A. O. Slobodeniuk, T. Kazimierczuk, P. Kapuściński, K. Oreszczuk, M. Grzeszczyk, M. Bartos, K. Nogajewski, K. Watanabe, T. Taniguchi, C. Faugeras, P. Kossacki, M. Potemski, A. Babiński and M. R. Molas, Nanoscale, 2020, 12, 18153
DOI: 10.1039/D0NR04243A

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