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- W2091077450 abstract "Separate theoretical and experimental investigations of the effect of lattice anharmonicity on the ${A}_{1g}$ phonon dynamics in photoexcited bismuth are presented. First-principles density functional calculations show that the anharmonic contribution to the phonon period is negligible for an excitation of 1.25% or less of the valence electrons, corresponding to electronic frequency softening from $2.9phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}2.3phantom{rule{0.3em}{0ex}}mathrm{THz}$. Experiments using optical double-pump-probe excitation of coherent phonon motion clearly separate the role of lattice anharmonicity from electron-hole plasma and other dynamics, confirming that the effect of anharmonicity on the phonon period is much smaller than the observed softening." @default.
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- W2091077450 date "2005-08-29" @default.
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- W2091077450 title "Effect of lattice anharmonicity on high-amplitude phonon dynamics in photoexcited bismuth" @default.
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- W2091077450 doi "https://doi.org/10.1103/physrevb.72.060301" @default.
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