Realistic exciton-phonon coupling is too weak for Dyakonov-Perel motional narrowing in MoS2; full-Brillouin-zone intervalley scattering shortens valley depolarization 3–4× to ~50 fs (300 K) and ~130 fs (10 K).
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Exciton valley depolarization in monolayer MoS2: non-Markovian quantum dynamics, intervalley scattering, and the breakdown of the Dyakonov-Perel mechanism
Realistic exciton-phonon coupling is too weak for Dyakonov-Perel motional narrowing in MoS2; full-Brillouin-zone intervalley scattering shortens valley depolarization 3–4× to ~50 fs (300 K) and ~130 fs (10 K).