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Article Dans Une Revue Physical Review B Année : 2022

Electroluminescence of monolayer WS 2 in a scanning tunneling microscope: Effect of bias polarity on spectral and angular distribution of emitted light

Julien Chaste
Elizabeth Boer-Duchemin
Gérald Dujardin
Andrey G Borisov
Eric Le Moal
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Résumé

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.
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Dates et versions

hal-03759969 , version 1 (24-08-2022)

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Ricardo Javier Peña Román, Delphine Pommier, Rémi Bretel, Luis Enrique Parra López, Etienne Lorchat, et al.. Electroluminescence of monolayer WS 2 in a scanning tunneling microscope: Effect of bias polarity on spectral and angular distribution of emitted light. Physical Review B, 2022, 106 (8), pp.085419. ⟨10.1103/PhysRevB.106.085419⟩. ⟨hal-03759969⟩
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