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Experimental observation of a negative grey trion in an electron-rich WSe2 monolayer
Jhih-Sian Tu1, Sven Borghardt, Detlev Grützmacher
1Peter Grünberg Institute 9 (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany.
Abstract:
We measure the evolution of low temperature photoluminescence in a WSe2 monolayer with increasing electron concentration level. By comparing non-resonant and resonant laser excitation, we find that the formation of negative trions is facilitated by very efficient phonon emission. The most prominent line in photolumienscence spectra in the intermediate range of carrier concentrations (below [Formula: see text] cm-2) is found to be 66 meV below the bright negative trion. Its measured properties, including low oscillator strength and the temperature dependence point to an interacting bright intervalley and dark intervalley trion state as the origin of the line.
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