PublicaHier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.
Terahertz absorption between split subbands in coupled Quantum Wells.
Terahertz Absorption zwischen aufgespaltenen Subbanden in gekoppelten 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.