  Carrier dynamics in monolayer MoS2 have been investigated using broadband
femtosecond transient absorption spectroscopy (FTAS). A tunable pump pulse was
used while a broadband probe pulse revealed ground and excited state carrier
dynamics. Interestingly, for pump wavelengths both resonant and non-resonant
with the A and B excitons, we observe a broad ground state bleach around 2.9
eV, with decay components similar to A and B. Associating this bleach with the
band nesting region between K and Gamma in the band structure indicates
significant k-space delocalization and overlap among excitonic wave functions
identified as A, B, C, and D. Comparison of time dynamics for all features in
resonance and non-resonance excitation is consistent with this finding.
