Back to Search Start Over

Excitons and trions in WSSe monolayers

Authors :
Olkowska-Pucko, Katarzyna
Blundo, Elena
Zawadzka, Natalia
Cianci, Salvatore
Vaclavkova, Diana
Kapuściński, Piotr
Jana, Dipankar
Pettinari, Giorgio
Felici, Marco
Nogajewski, Karol
Bartos, Miroslav
Watanabe, Kenji
Taniguchi, Takashi
Faugeras, Clement
Potemski, Marek
Babiński, Adam
Polimeni, Antonio
Molas, Maciej R.
Source :
2D Materials 10, 015018 (2023)
Publication Year :
2022

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 characteristics. By making use of photoluminescence spectroscopy, we investigate optical properties of WSSe MLs with a S/Se ratio of 57/43 deposited on SiO$_2$/Si substrate and encapsulated in hexagonal BN flakes. Similarly to the $"parent"$ WS$_2$ and WSe$_2$ MLs, we assign the WSSe MLs to the ML family with the dark ground exciton state. We find that, in addition to 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.<br />Comment: 6 pages, 5 figures, +ESI

Details

Database :
arXiv
Journal :
2D Materials 10, 015018 (2023)
Publication Type :
Report
Accession number :
edsarx.2209.10521
Document Type :
Working Paper
Full Text :
https://doi.org/10.1088/2053-1583/aca915