Excitons and trions in WSSe monolayers

Katarzyna Olkowska Pucko; Elena Blundo; Natalia Zawadzka; Salvatore Cianci; Diana Vaclavkova; Piotr Kapuściński; Dipankar Jana; Giorgio Pettinari; Marco Felici; Karol Nogajewski; Miroslav Bartoš; Kenji Watanabe; Takashi Taniguchi; Clement Faugeras; Marek Potemski; Adam Babiński; Antonio Polimeni; Maciej R Molas

doi:10.1088/2053-1583/aca915

ジャーナル論文 Excitons and trions in WSSe monolayers

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Katarzyna Olkowska Pucko, Elena Blundo, Natalia Zawadzka, Salvatore Cianci, Diana Vaclavkova, Piotr Kapuściński, Dipankar Jana, Giorgio Pettinari, Marco Felici, Karol Nogajewski, Miroslav Bartoš, Kenji Watanabe, Takashi Taniguchi, Clement Faugeras, Marek Potemski, Adam Babiński, Antonio Polimeni, Maciej R Molas. Excitons and trions in WSSe monolayers. 2D Materials. 2023, 10 (1), 015018. https://doi.org/10.1088/2053-1583/aca915

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(abstract)

The possibility of almost linear tuning of the band gap and of the electrical and optical properties in monolayers (MLs) of semiconducting transition metal dichalcogenide (S-TMD) alloys opens up the way to fabricate materials with on-demand properties. We investigate the optical properties of WSSe MLs with an S/Se ratio of 57/43 deposited on SiO2/Si substrate and encapsulated in hexagonal BN (hBN) flakes using photoluminescence (PL) spectroscopy. Similarly to the ”parents” WS2 and WSe2 MLs, we assign the WSSe MLs to the ML family with the dark ground exciton state. We find that, except for the neutral bright A exciton line, three observed emission lines are associated with negatively charged excitons. The application of in-plane and out-of-plane magnetic fields allows us to assign undeniably the bright and dark (spin- and momentum-forbidden) negative trions as well as the phonon replica of the dark spin-forbidden complex. Furthermore, the existence of the single photon emitters in the WSSe ML is also demonstrated thus prompting the opportunity to enlarge the wavelength range for potential future quantum applications of S-TMDs.

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