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The nature of excited states of open quantum systems produced by incoherentnatural thermal light is analyzed based on a description of the generator ofthe dynamics. Natural thermal light is shown to generate long-lasting coherentdynamics because of (i) the super-Ohmic character of the radiation, and (ii)the absence of pure dephasing dynamics. In the presence of an environment, thelong-lasting coherences induced by suddenly turned-on incoherent lightdissipate and stationary coherences are established. As a particularapplication, dynamics in a subunit of the PC-645 light-harvesting complex isconsidered where it is further shown that aspects of the energy pathwayslandscape depend on the nature of the exciting light and number of chromophoresexcited. Specifically, pulsed laser and natural broadband incoherent excitationinduce significantly different energy transfer pathways. In addition, wediscuss differences in perspective associated with the eigenstate vs sitebasis, and note an important difference in the phase of system coherences whencoupled to blackbody radiation or when coupled to a phonon background. Finally,an Appendix contains an open systems example of the loss of coherence as theturn on time of the light assumes natural time scales.

Open System Perspective on Incoherent Excitation of Light Harvesting Systems