Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells

Niko S. Köster; Andrea C. Klettke; Benjamin Ewers; Ronja Woscholski; Stefano Cecchi; Daniel Chrastina; Giovanni Isella; Mackillo Kira; Stephan W. Koch; Sangam Chatterjee

doi:10.1088/1367-2630/15/7/075004

Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells

Niko S. Köster, Andrea C. Klettke, Benjamin Ewers, Ronja Woscholski, Stefano Cecchi, Daniel Chrastina, Giovanni Isella, Mackillo Kira, Stephan W. Koch, Sangam Chatterjee

Optical Sciences, College of

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

6 Scopus citations

Abstract

The interaction of strong single-cycle THz pulses with the optically induced polarization in germanium quantum wells is studied. With increasing THz field strength, it is observed that the excitonic resonances shift toward higher energy and broaden before weak signatures of a splitting of the exciton line occur. In comparison with high-quality GaAs-based quantum wells, where a much clearer Autler-Townes splitting is observed, the germanium system response is significantly more broadened and shows signatures of a quasi-steady-state behavior due to the intrinsic fast dephasing times dominated by intervalley scattering.

Original language	English (US)
Article number	075004
Journal	New Journal of Physics
Volume	15
DOIs	https://doi.org/10.1088/1367-2630/15/7/075004
State	Published - Jul 2013

ASJC Scopus subject areas

Physics and Astronomy(all)

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Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells. / Köster, Niko S.; Klettke, Andrea C.; Ewers, Benjamin; Woscholski, Ronja; Cecchi, Stefano; Chrastina, Daniel; Isella, Giovanni; Kira, Mackillo; Koch, Stephan W.; Chatterjee, Sangam.

In: New Journal of Physics, Vol. 15, 075004, 07.2013.

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

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abstract = "The interaction of strong single-cycle THz pulses with the optically induced polarization in germanium quantum wells is studied. With increasing THz field strength, it is observed that the excitonic resonances shift toward higher energy and broaden before weak signatures of a splitting of the exciton line occur. In comparison with high-quality GaAs-based quantum wells, where a much clearer Autler-Townes splitting is observed, the germanium system response is significantly more broadened and shows signatures of a quasi-steady-state behavior due to the intrinsic fast dephasing times dominated by intervalley scattering.",

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AU - Ewers, Benjamin

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AU - Cecchi, Stefano

AU - Chrastina, Daniel

AU - Isella, Giovanni

AU - Kira, Mackillo

AU - Koch, Stephan W.

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