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 | |
| State | Published - Jul 2013 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
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
}
TY - JOUR
T1 - Controlling the polarization dynamics by strong THz fields in photoexcited germanium quantum wells
AU - Köster, Niko S.
AU - Klettke, Andrea C.
AU - Ewers, Benjamin
AU - Woscholski, Ronja
AU - Cecchi, Stefano
AU - Chrastina, Daniel
AU - Isella, Giovanni
AU - Kira, Mackillo
AU - Koch, Stephan W
AU - Chatterjee, Sangam
PY - 2013/7
Y1 - 2013/7
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84880438064&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84880438064&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/15/7/075004
DO - 10.1088/1367-2630/15/7/075004
M3 - Article
VL - 15
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 075004
ER -