Long intersubband relaxation times in n -type germanium quantum wells

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 (14-29meV)...

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Bibliographic Details
Published in:Applied physics letters 2011-11, Vol.99 (20), p.201101-201101-3
Main Authors: Ortolani, Michele, Stehr, Dominik, Wagner, Martin, Helm, Manfred, Pizzi, Giovanni, Virgilio, Michele, Grosso, Giuseppe, Capellini, Giovanni, De Seta, Monica
Format: Article
Language:English
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Summary: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 (14-29meV), as measured by terahertz absorption spectroscopy and in agreement with band structure calculations. Temperature-independent lifetimes in excess of 30ps were observed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3662394