Phonons and excitons (IMAGE)
Caption
Although the average crystal structure in CuInSnS4 is cubic, phonons and excitons sense disorder in different ways. Left: Phonon modes remain consistent with the cubic structure. Right: In contrast, localized excitons are sensitive to local symmetry breaking associated with cation disorder and exhibit a pronounced anisotropic excitonic response.
Credit
Adv.Opt.Mat. doi/10.1002/adom.71392
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CC BY-SA