Above the free-carrier gap in WSe2 and MoS2 monolayers, bright-exciton emission is stronger for circular than linear excitation while valley coherence survives, showing geminate and bimolecular exciton formation coexist.
#!!$"%=2. On the contrary, the same reasoning applied to the geminate formation leads to a luminescence intensity which does not depend on the polarization of the excitation: !!
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Exciton Formation in Two-Dimensional Semiconductors
Above the free-carrier gap in WSe2 and MoS2 monolayers, bright-exciton emission is stronger for circular than linear excitation while valley coherence survives, showing geminate and bimolecular exciton formation coexist.