Dark trions govern the temperature-dependent optical absorption and emission of doped atomically thin semiconductors
Abstract
We perform absorption and photoluminescence spectroscopy of trions in hBN-encapsulated WSe2, WS2, MoSe2, and MoS2 monolayers, depending on temperature. The different trends for W- and Mo-based materials are excellently reproduced considering a Fermi-Dirac distribution of bright and dark trions. We find a dark trion, XD- 19 meV below the lowest bright trion, X1- in WSe2 and WS2. In MoSe2, XD- lies 6 meV above X1-, while XD- and X1- almost coincide in MoS2. Our results agree with GW-BSE ab-initio calculations and quantitatively explain the optical response of doped monolayers with temperature.
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