vs at some selected values of .
(a) and (b) as functions of [cf. Eqs. (12) and (13), respectively].
Density matrix evolutions: exact (red line), HQME0 (gray dashed line), and HQME1 (black line). The energy parameters are reported in units of , while the time variable is in units of . Both the applicability parameters, and , are about equal to or larger than 5 [cf. Eq. (15a)].
The same as in Fig. 3, but with one applicability parameter, , being around the boundary of applicability [cf. Eq. (15b)].
The same as in Fig. 3, but with the applicability parameters, and , being both around the boundary of applicability [cf. Eq. (15b)].
Transient absorption signals via HQME1 (black line) vs the exact dynamics (thin red line) of the model dimer exciton system (see parameters in text) at . This is in the HQME1 accurate regime by Eq. (15a); i.e., both and are larger than 5. (a) Linear absorption coefficient , (b) nonlinear absorptive , and (c) nonlinear emissive components of the frequency-dispersed difference transient probe absorption coefficient. The pump pulse frequency is centered at , as indicated by the arrow in panel (a).
The same as in Fig. 6, but now the system is at , falling into the HQME1 semiquantitative regime by Eq. (15b).
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