| Full text | |
| Author(s): Show less - |
Pena Roman, Ricardo Javier
;
Pommier, Delphine
;
Bretel, Remi
;
Lopez, Luis E. Parra
;
Lorchat, Etienne
;
Chaste, Julien
;
Ouerghi, Abdelkarim
;
Le Moal, Severine
;
Boer-Duchemin, Elizabeth
;
Dujardin, Gerald
;
Borisov, Andrey G.
;
Zagonel, Luiz F.
;
Schull, Guillaume
;
Berciaud, Stephane
;
Le Moal, Eric
Total Authors: 15
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 106, n. 8, p. 7-pg., 2022-08-24. |
| Abstract | |
Inelastic electron tunneling in a scanning tunneling microscope is used to generate excitons in monolayer tungsten disulfide (WS2). Excitonic electroluminescence is measured both at positive and negative sample bias. Using optical spectroscopy and Fourier-space optical microscopy, we show that the bias polarity of the tunnel junction determines the spectral and angular distribution of the emitted light. At positive sample bias, only emission from excitonic species featuring an in-plane transition dipole moment is detected. Based on the spectral distribution of the emitted light, we infer that the dominant contribution is from charged excitons, i.e., trions. At negative sample bias, additional contributions from lower-energy excitonic species are evidenced in the emission spectra and the angular distribution of the emitted light reveals a mixed character of in-plane and out-of-plane transition dipole moments. (AU) | |
| FAPESP's process: | 18/08543-7 - Light emission by individual defects in 2D materials |
| Grantee: | Ricardo Javier Peña Román |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 20/12480-0 - Single-photon emission from point defects and substrate-induced hot spots in two-dimensional semiconductors: a scanning tunnelling microscopy-induced luminescence study |
| Grantee: | Ricardo Javier Peña Román |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 14/23399-9 - Heterostructures in semiconducting nanowires: nanometric light emitters studied by scanning tunnelling microscopy |
| Grantee: | Luiz Fernando Zagonel |
| Support Opportunities: | Research Grants - Young Investigators Grants |