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We investigate ultrafast phonon dynamics in the Bi$_{1-x}$Sb$_{x}$ alloysystem for various compositions $x$ using a reflective femtosecond pump-probetechnique. The coherent optical phonons corresponding to the A$_{1g}$ localvibrational modes of Bi-Bi, Bi-Sb, and Sb-Sb are generated and observed in thetime domain with a few picoseconds dephasing time. The frequencies of thecoherent optical phonons were found to change as the Sb composition $x$ wasvaried, and more importantly, the relaxation time of those phonon modes wasdramatically reduced for $x$ values in the range 0.5--0.8. We argue that thephonon relaxation dynamics are not simply governed by alloy scattering, but aresignificantly modified by anharmonic phonon-phonon scattering with impliedminor contributions from electron-phonon scattering in a Weyl-semimetal phase.

Ultrafast scattering dynamics of coherent phonons in Bi$_{1-x}$Sb$_{x}$ in the Weyl semimetal phase