Ultrafast nonlinear optical response of photoexcited Ge/SiGe quantum wells: Evidence for a femtosecond transient population inversion

C. Lange; N. S. Köster; S. Chatterjee; H. Sigg; D. Chrastina; G. Isella; H. Von Känel; M. Schäfer; M. Kira; S. W. Koch

doi:10.1103/PhysRevB.79.201306

Ultrafast nonlinear optical response of photoexcited Ge/SiGe quantum wells: Evidence for a femtosecond transient population inversion

C. Lange, N. S. Köster, S. Chatterjee, H. Sigg, D. Chrastina, G. Isella, H. Von Känel, M. Schäfer, M. Kira, S. W. Koch

Optical Sciences, College of

Research output: Contribution to journal › Article › peer-review

81 Scopus citations

Abstract

Femtosecond time-resolved pump-probe spectroscopy is used to investigate the ultrafast carrier dynamics of Ge/SiGe quantum wells grown on a Si substrate. Pronounced nonequilibrium effects in the relaxation dynamics of the optically injected carrier distributions are observed and analyzed using a microscopic many-body theory. Transient population inversion and optical gain is obtained on a femtosecond time scale for excitation at energies slightly above the lowest direct quantum-well transition.

Original language	English (US)
Article number	201306
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.79.201306
State	Published - May 1 2009

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Lange, C., Köster, N. S., Chatterjee, S., Sigg, H., Chrastina, D., Isella, G., Von Känel, H., Schäfer, M., Kira, M., & Koch, S. W. (2009). Ultrafast nonlinear optical response of photoexcited Ge/SiGe quantum wells: Evidence for a femtosecond transient population inversion. Physical Review B - Condensed Matter and Materials Physics, 79(20), [201306]. https://doi.org/10.1103/PhysRevB.79.201306

Ultrafast nonlinear optical response of photoexcited Ge/SiGe quantum wells : Evidence for a femtosecond transient population inversion. / Lange, C.; Köster, N. S.; Chatterjee, S.; Sigg, H.; Chrastina, D.; Isella, G.; Von Känel, H.; Schäfer, M.; Kira, M.; Koch, S. W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 20, 201306, 01.05.2009.

Research output: Contribution to journal › Article › peer-review

Lange, C, Köster, NS, Chatterjee, S, Sigg, H, Chrastina, D, Isella, G, Von Känel, H, Schäfer, M, Kira, M & Koch, SW 2009, 'Ultrafast nonlinear optical response of photoexcited Ge/SiGe quantum wells: Evidence for a femtosecond transient population inversion', Physical Review B - Condensed Matter and Materials Physics, vol. 79, no. 20, 201306. https://doi.org/10.1103/PhysRevB.79.201306

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AU - Isella, G.

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Ultrafast nonlinear optical response of photoexcited Ge/SiGe quantum wells: Evidence for a femtosecond transient population inversion

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