Title :
Coherent and incoherent intersubband dynamics
Author :
Muller, T. ; Bratschitsch, R. ; Parz, W. ; Strasser, G. ; Unterrainer, K.
Author_Institution :
Inst. for Solid State Electron., Tech. Univ. of Vienna, Austria
Abstract :
Presents time-resolved measurements of photoinduced intersubband absorption in an undoped GaAs/AlGaAs coupled quantum well excited by an ultrashort interband optical pulse. An interband pump pulse injects electrons into the first and second subband of an undoped asymmetric double quantum well (ADQW) with a level spacing smaller than the LO phonon energy. The time evolution of the electron population in these two subbands is monitored by probing the MIR intersubband transitions to a third (empty) subband.
Keywords :
III-V semiconductors; aluminium compounds; band structure; carrier relaxation time; gallium arsenide; semiconductor quantum wells; time resolved spectra; GaAs-AlGaAs; GaAs/AlGaAs; MIR intersubband transitions; coherent intersubband dynamics; electron population; incoherent intersubband dynamics; interband pump pulse; level spacing; photoinduced intersubband absorption; time evolution; time-resolved measurements; ultrashort interband optical pulse; undoped coupled quantum well; Absorption; Gallium arsenide; Laser beams; Optical pulse generation; Optical pulses; Probes; Pulse measurements; Quantum cascade lasers; Substrates; Zinc compounds;
Conference_Titel :
Terahertz Electronics Proceedings, 2002. IEEE Tenth International Conference on
Print_ISBN :
0-7803-7630-7
DOI :
10.1109/THZ.2002.1037584
