Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides

journal article in Web of Science

English

We present low-temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field B applied to monolayers of different semiconducting transition metal dichalcogenides. For WSe2 and WS2 monolayers, the dark exciton emission is observed at ∼50 meV below the bright exciton peak and displays a characteristic doublet structure whose intensity grows with B2 , while no magnetic field induced emission peaks appear for MoSe2 monolayer. Our experiments also show that the MoS2 monolayer has a dark exciton ground state with a dark-bright exciton splitting energy of ∼100 meV.

transition metal dichalcogenides monolayers; tungsten diselenide; tungsten disulfide; molybdenum diselenide; molybdenum disulfide; dark excitons; Voigt configuration

MOLAS, M.; FAUGERAS, C.; SLOBODENIUK, A.; NOGAJEWSKI, K.; BARTOŠ, M.; BASKO, D.; POTEMSKI, M.

1. 6. 2017

2053-1583

2D Materials

4

2

United Kingdom of Great Britain and Northern Ireland

021003-1

021003-6

6