"Frequency-selective excitation of high-wavevector phonons"

Samuel W. Teitelbaum: Thomas Henighan, Hanzhe Liu, Mason P. Jiang, Michael Kozina, Diling Zhu, Matthieu Chollet, Takahiro Sato, James M. Glownia, Mariano Trigo, and David A. Reis; Applied Physics Letters, 10/22/18.

Additional Authors: Thomas Henighan, Hanzhe Liu, Mason P. Jiang, Michael Kozina, Diling Zhu, Matthieu Chollet, Takahiro Sato, James M. Glownia, Mariano Trigo, and David A. Reis

Abstract:

We demonstrate the selective excitation of a narrow frequency band of TA phonons throughout the Brillouin zone of germanium using a sinusoidally modulated picosecond laser pulse. The pulse is produced through the combination of two chirped and delayed pulses using a stabilized interferometer. The phonon excitations are probed by time- and momentum- resolved x-ray diffuse scattering.