Reflectivity oscillations of laser-excited Bi: imprint of atomic vibrations through electron-phonon coupling

Experimental and theoretical studies of probe beam reflectivity oscillations from single-crystal bismuth excited by fs-laser pulses are presented. Pump-probe technique with accuracy of 10
^-5
and time-resolution of 35 fs is used to measure the reflectivity. Results show that reflectivity oscillations are related to the atomic vibrations predominantly via electron-phonon coupling.