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

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 languageEnglish (US)
Article number075004
JournalNew Journal of Physics
Volume15
DOIs
StatePublished - Jul 2013
Externally publishedYes

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germanium
signatures
quantum wells
quasi-steady states
polarization
field strength
excitons
cycles
shift
pulses
scattering
interactions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Köster, N. S., Klettke, A. C., Ewers, B., Woscholski, R., Cecchi, S., Chrastina, D., ... Chatterjee, S. (2013). Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells. New Journal of Physics, 15, [075004]. https://doi.org/10.1088/1367-2630/15/7/075004

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 journalArticle

Köster, NS, Klettke, AC, Ewers, B, Woscholski, R, Cecchi, S, Chrastina, D, Isella, G, Kira, M, Koch, SW & Chatterjee, S 2013, 'Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells', New Journal of Physics, vol. 15, 075004. https://doi.org/10.1088/1367-2630/15/7/075004
Köster, Niko S. ; Klettke, Andrea C. ; Ewers, Benjamin ; Woscholski, Ronja ; Cecchi, Stefano ; Chrastina, Daniel ; Isella, Giovanni ; Kira, Mackillo ; Koch, Stephan W ; Chatterjee, Sangam. / Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells. In: New Journal of Physics. 2013 ; Vol. 15.
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