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During the ultraintense laser interaction with solids (overdense plasmas),the competition between two possible quantum electrodynamics (QED) mechanismsresponsible for $e^\pm$ pair production, i.e., linear and nonlinearBreit-Wheeler (BW) processes, remains to be studied. Here, we have implementedthe linear BW process via a Monte Carlo algorithm into the QED particle-in-cell(PIC) code YUNIC, enabling us to self-consistently investigate both pairproduction mechanisms in the plasma environment. By a series of 2D QED-PICsimulations, the transition from the linear to the nonlinear BW process isobserved with the increase of laser intensities in the typical configuration ofa linearly polarized laser interaction with solid targets. A criticalnormalized laser amplitude about $a_0\sim$ 400-500 is found under a large rangeof preplasma scale lengths, below which the linear BW process dominates overthe nonlinear BW process. This work provides a practicable technique to modellinear QED processes via integrated QED-PIC simulations. Moreover, it calls formore attention to be paid to linear BW pair production in near future10-PW-class laser-solid interactions.

From linear to nonlinear Breit-Wheeler pair production in laser-solid interactions