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The plot of the imaginary components of the OC in Au, Al, AuAl2, and AuAl. (a) Contribution due to first‐order perturbation accounting for direct inter‐band and intraband electronic transitions. (b) The contribution due to second‐order perturbation theory due to phonon‐assisted indirect electronic transitions. Reprinted from Ref. [179], Copyright (2021), with permission from Elsevier.
