Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
Long intersubband relaxation times in n-type germanium quantum wells
Ortolani, M.; Stehr, D.; Wagner, M.; Helm, M.; Pizzi, G.; Virgilio, M.; Grosso, G.; Capellini, G.; de Seta, M.
We measured the non-radiative intersubband relaxation time in n-type modulation-doped Ge/SiGe multi-quantum wells of different thickness by means of degenerate pump-probe experiments. The photon energy was tuned to be resonant with the lowest conduction band intersubband transitionenergy (14-29 meV), as measured by terahertz absorption spectroscopy and in agreement with bandstructure calculations. Temperature-independent lifetimes in excess of 30 ps were observed.
Keywords: intersubband; germanium; free-electron laser; relaxation time; terahertz
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 16262) publication
- Applied Physics Letters 99(2011), 201101