Title :
Coherent wavepackets and phonons in superlattices
Author :
Dekorsky, T. ; Bartels, A. ; Kurz, H. ; Kohler, K.
Author_Institution :
Inst. fur Halbleitertech., Tech. Hochschule Aachen, Germany
Abstract :
Coupled Bloch-phonon modes are investigated in GaAs-Al0.3 Ga0.7As superlattices with electronic miniband widths larger than the GaAs LO phonon energy of 36 meV. Bloch oscillations are excited by a 50 fs laser pulse from a Ti:sapphire laser with the excitation energy tuned in resonance with the lower branches of the Wannier-Stark ladder. The dynamics of the coherent motion of the Bloch wavepackets is traced in time-resolved electrooptic transmission and reflectivity experiments
Keywords :
III-V semiconductors; aluminium compounds; excited states; gallium arsenide; high-speed optical techniques; laser beam effects; phonon-phonon interactions; semiconductor superlattices; 36 meV; 50 fs; Bloch oscillation excitation; Bloch wavepackets; GaAs LO phonon energy; GaAs-Al0.3Ga0.7As; GaAs-Al0.3Ga0.7As superlattices; Ti:sapphire laser; Wannier-Stark ladder; coherent motion; coherent wavepackets; coupled Bloch-phonon modes; electronic miniband widths; fs laser pulse; phonons; superlattices; time resolved reflectivity experiments; time-resolved electrooptic transmission; Gallium arsenide; Laser excitation; Laser modes; Laser tuning; Lasers and electrooptics; Optical pulses; Phonons; Reflectivity; Resonance; Superlattices;
Conference_Titel :
Nonlinear Optics '98: Materials, Fundamentals and Applications Topical Meeting
Conference_Location :
Kauai, HI
Print_ISBN :
0-7803-4950-4
DOI :
10.1109/NLO.1998.710356
