2024-03-29T14:18:32Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/146362022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Acoustic phonon generation and detection in GaAs/Al_{0.3}Ga_{0.7}As quantum wells with picosecond laser pulsesMatsuda, O.Tachizaki, T.Fukui, T.Baumberg, J. J.Wright, O. B.424Picosecond acoustic-phonon pulse generation and detection is investigated in a sample containing three GaAs/Al0.3Ga0.7As quantum wells of different thickness with an interferometric optical pump and probe technique. The pump photon energy is tuned through the hh1-e1 transitions of each well and the probe photon energy is chosen to allow the detection of the phonon pulses at the sample surface. The phonon pulse shapes are explained with a model that relates the carrier wave functions to the acoustic strain, and the acoustic strain to the detected optical reflectance and phase changes.American Physical SocietyJournal Articleapplication/pdfhttp://hdl.handle.net/2115/14636https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/14636/1/PRB71.pdf0163-18291095-3795Physical Review B71111153302005enginfo:doi/10.1103/PhysRevB.71.115330Copyright © 2005 American Physical Societypublisher