| Full text | |
| Author(s): Show less - |
Pena Roman, Ricardo Javier
;
Bretel, Remi
;
Pommier, Delphine
;
Lopez, Luis Enrique Parra
;
Lorchat, Etienne
;
Boer-Duchemin, Elizabeth
;
Dujardin, Gerald
;
Borisov, Andrei G.
;
Zagonel, Luiz Fernando
;
Schull, Guillaume
;
Berciaud, Stephane
;
Le Moal, Eric
Total Authors: 12
|
| Document type: | Journal article |
| Source: | Nano Letters; v. 22, n. 23, p. 8-pg., 2022-12-14. |
| Abstract | |
The photoluminescence (PL) of monolayer tungsten disulfide (WS2) is locally and electrically controlled using the nonplasmonic tip and tunneling current of a scanning tunneling microscope (STM). The spatial and spectral distribution of the emitted light is determined using an optical microscope. When the STM tip is engaged, short-range PL quenching due to near-field electromagnetic effects is present, independent of the sign and value of the bias voltage applied to the tip-sample tunneling junction. In addition, a bias-voltage-dependent long-range PL quenching is measured when the sample is positively biased. We explain these observations by considering the native n-doping of monolayer WS2 and the charge carrier density gradients induced by electron tunneling in micrometer-scale areas around the tip position. The combination of wide-field PL microscopy and charge carrier injection using an STM opens up new ways to explore the interplay between excitons and charge carriers in two-dimensional semiconductors. (AU) | |
| 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 |
| 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 |