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. 2016 Jul 14;6:29437. doi: 10.1038/srep29437

Figure 1.

Figure 1

(a) Schematic of the relevant energy levels in our model along with their couplings. (be) Double-sided Feynman diagrams contributing to the 4th order population. Incoming and outgoing arrows indicate interactions with the laser fields along with their phase. Inline graphic is the final projection onto the outgoing polaron states that contribute to the photocurrent.