62 citations · 190 across the 4 of their papers we have counts for
4 papers
Mechanical and Electronic Properties of Ferromagnetic GaMnAs Using Ultrafast Coherent Acoustic Phonons
J. Qi, J. A. Yan, H. Park +7
Ultrafast two-color pump-probe measurements, involving coherent acoustic phonon (CAP) waves, have provided information simultaneously on the mechanical properties and on the electr…
Coherent Magnetization Precession in GaMnAs induced by Ultrafast Optical Excitation
J. Qi, Y. Xu, N. Tolk +3
We use femtosecond optical pulses to induce, control and monitor magnetization precession in ferromagnetic Ga0.965Mn0.035As. At temperatures below ~40 K we observe coherent oscilla…
Near-bandgap wavelength-dependent studies of long-lived traveling coherent longitudinal acoustic phonon oscillations in GaSb/GaAs systems
J. K. Miller, J. Qi, Y. Xu +6
We report first studies of long-lived oscillations in optical pump-probe measurements on GaSb-GaAs heterostructures. The oscillations arise from a photogenerated coherent longitudi…
Time-resolved dynamics of the superconducting two-gap state in MgB2 thin films
Y. Xu, M. Khafizov, L. Satrapinsky +3
Femtosecond pump-probe studies show that carrier dynamics in MgB2 films is governed by the sub-ps electron-phonon (e-ph) relaxation present at all temperatures, the few-ps e-ph pro…