Photoexcitation of SnSe nucleates higher-symmetry semi-metallic phase domains within 200 fs, producing phase heterogeneity that suppresses long-range charge transport at high fluences.
This dynamic narrowing with increasing fluence is counter to the general expectation that phonon features broaden as excited photocarriers transfer their energy to the lattice [57]
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Photoinduced phase heterogeneity and charge localization in SnSe
Photoexcitation of SnSe nucleates higher-symmetry semi-metallic phase domains within 200 fs, producing phase heterogeneity that suppresses long-range charge transport at high fluences.