In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules - INSA Toulouse - Institut National des Sciences Appliquées de Toulouse Access content directly
Journal Articles Physical Review Letters Year : 2017

In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules

Abstract

The optical selection rules for interband transitions in WSe2, WS2, and MoSe2 transition metal dichalcogenide monolayers are investigated by polarization-resolved photoluminescence experiments with a signal collection from the sample edge. These measurements reveal a strong polarization dependence of the emission lines. We see clear signatures of the emitted light with the electric field oriented perpendicular to the monolayer plane, corresponding to an interband optical transition forbidden at normal incidence used in standard optical spectroscopy measurements. The experimental results are in agreement with the optical selection rules deduced from group theory analysis, highlighting the key role played by the different symmetries of the conduction and valence bands split by the spin-orbit interaction. These studies yield a direct determination of the bright-dark exciton splitting, for which we measure 40±1  meV and 55±2  meV in WSe2 and WS2 monolayer, respectively.
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Dates and versions

hal-02056600 , version 1 (04-03-2019)

Identifiers

  • HAL Id : hal-02056600 , version 1

Cite

Gang Wang, Cédric Robert, M. m. Glazov, Fabian Cadiz, Emmanuel Courtade, et al.. In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules. Physical Review Letters, 2017, 119 (4). ⟨hal-02056600⟩
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