Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3662394
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- European Community [226716]
- Italian Ministry of Research [FIRB Italnanonet RBPR05JH2P_014, FIRB Futuro in Ricerca RBFR08N9L9]
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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 transition energy (14-29 meV), as measured by terahertz absorption spectroscopy and in agreement with band structure calculations. Temperature-independent lifetimes in excess of 30 ps were observed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3662394]
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