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Terahertz absorption between split subbands in coupled Quantum Wells.

Terahertz Absorption zwischen aufgespaltenen Subbanden in gekoppelten Quantum Wells
: Cunningham, J.; Köhler, K.; Nuss, M.C.; Roskos, H.; Shah, J.; Tell, B.

Optical Society of America -OSA-, Washington/D.C.:
OSA Proceedings on Picosecond Electronics and Optoelectronics. Vol.9
Washington/D.C., 1991
S.24-30 : Abb.,Lit.
Picosecond Electronics and Optoelectronics <1991, Salt Lake City/Utah>
Fraunhofer IAF ()
heterostructure; Heterostruktur; III-V Halbleiter; III-V semiconductors; picosecond optoelectronic; quantum wells

The transition between split subbands (design splitting: 5 meV) in n-doped coupled quantum wells is investigated by time-domain spectroscopy with ultrafast pulses of far-infrared radiation. This very strong transition has a linewidth of 2.5 meV. The maximum absorption is observed at 4.2 meV photon energy, lower than the design splitting. We attribute this down-shift of the peak absorption tentatively to the influence of many-body interactions which lead to correction terms for the calculated transition energy in the same order of magnitude as the transition energy itself.