Abstract
The ultrafast carrier dynamics of Ge/SiGe quantum wells on Si substrate is investigated by pump-probe spectroscopy. Spectrally tunable 80 fs pulses emitted by an opto-parametric amplifier are used to excite the sample and a white-light supercontinuum generated from a 1 kHz Ti:sapphire regenerative amplifier system is used to probe the sample transmission. Pronounced nonequilibrium effects are observed in the relaxation dynamics. The pump energy dependence of these effects is discussed. If the sample is excited under close-to-resonant pumping conditions, transient gain is observed. The findings are explained using a microscopic many-body theory.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1109-1112 |
| Number of pages | 4 |
| Journal | Physica Status Solidi (C) Current Topics in Solid State Physics |
| Volume | 8 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 2011 |
| Externally published | Yes |
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Keywords
- Carrier dynamics
- Gain
- Germanium
- Pump-probe
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Ultrafast transient gain in Ge/SiGe quantum wells. / Köster, N. S.; Lange, C.; Kolata, K.; Chatterjee, S.; Chrastina, D.; Isella, G.; von Känel, H.; Sigg, H.; Schäfer, M.; Kira, M.; Koch, Stephan W.
In: Physica Status Solidi (C) Current Topics in Solid State Physics, Vol. 8, No. 4, 04.2011, p. 1109-1112.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ultrafast transient gain in Ge/SiGe quantum wells
AU - Köster, N. S.
AU - Lange, C.
AU - Kolata, K.
AU - Chatterjee, S.
AU - Chrastina, D.
AU - Isella, G.
AU - von Känel, H.
AU - Sigg, H.
AU - Schäfer, M.
AU - Kira, M.
AU - Koch, Stephan W
PY - 2011/4
Y1 - 2011/4
N2 - The ultrafast carrier dynamics of Ge/SiGe quantum wells on Si substrate is investigated by pump-probe spectroscopy. Spectrally tunable 80 fs pulses emitted by an opto-parametric amplifier are used to excite the sample and a white-light supercontinuum generated from a 1 kHz Ti:sapphire regenerative amplifier system is used to probe the sample transmission. Pronounced nonequilibrium effects are observed in the relaxation dynamics. The pump energy dependence of these effects is discussed. If the sample is excited under close-to-resonant pumping conditions, transient gain is observed. The findings are explained using a microscopic many-body theory.
AB - The ultrafast carrier dynamics of Ge/SiGe quantum wells on Si substrate is investigated by pump-probe spectroscopy. Spectrally tunable 80 fs pulses emitted by an opto-parametric amplifier are used to excite the sample and a white-light supercontinuum generated from a 1 kHz Ti:sapphire regenerative amplifier system is used to probe the sample transmission. Pronounced nonequilibrium effects are observed in the relaxation dynamics. The pump energy dependence of these effects is discussed. If the sample is excited under close-to-resonant pumping conditions, transient gain is observed. The findings are explained using a microscopic many-body theory.
KW - Carrier dynamics
KW - Gain
KW - Germanium
KW - Pump-probe
UR - http://www.scopus.com/inward/record.url?scp=79953752969&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79953752969&partnerID=8YFLogxK
U2 - 10.1002/pssc.201000857
DO - 10.1002/pssc.201000857
M3 - Article
VL - 8
SP - 1109
EP - 1112
JO - Physica Status Solidi (C) Current Topics in Solid State Physics
JF - Physica Status Solidi (C) Current Topics in Solid State Physics
SN - 1862-6351
IS - 4
ER -