Coherent wavepackets and phonons in superlattices

Author

Dekorsky, T. ; Bartels, A. ; Kurz, H. ; Kohler, K.

Author_Institution

Inst. fur Halbleitertech., Tech. Hochschule Aachen, Germany

fYear

1998

fDate

10-14 Aug 1998

Firstpage

458

Lastpage

460

Abstract

Coupled Bloch-phonon modes are investigated in GaAs-Al_0.3Ga_0.7As 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-Al_0.3Ga_0.7As; GaAs-Al_0.3Ga_0.7As 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nonlinear Optics '98: Materials, Fundamentals and Applications Topical Meeting

Conference_Location

Kauai, HI

Print_ISBN

0-7803-4950-4

Type

conf

DOI

10.1109/NLO.1998.710356

Filename

710356