Fig. 4: Temperature and pump-energy dependence of exciton spin dynamics.
From: Transient circular dichroism and exciton spin dynamics in all-inorganic halide perovskites
a Normalized kinetics of CDΔT/T with vertical offsets as a function of lattice temperature at a fixed pump fluence of ~0.2 μJ/cm2. The black lines are the fitting results with bi-exponential decays. The inset shows exciton spin decay times (τWex, orange circles) due to the exchange interaction and the initial fast-decay component (τf, gray circles) at different temperature. b Time evolution of σ+ σ− and σ+ σ− TA spectra under a nonresonant pumping at room temperature. The pump fluence is ~0.9 μJ/cm2.
