Photoexcitation of bismuth weakens the nearest-neighbor interatomic force by up to about 50%, driving the softening of the A1g optical mode and transverse acoustic modes.
The incident fluence of the 800 nm p-polarized, 65 fs excitation laser was varied between 2
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Measurements of Nonequilibrium Interatomic Forces in Photoexcited Bismuth
Photoexcitation of bismuth weakens the nearest-neighbor interatomic force by up to about 50%, driving the softening of the A1g optical mode and transverse acoustic modes.