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Proceedings Paper

Optical tailoring of electron and hole spin polarization in bulk germanium
Author(s): J. Lohrenz; T. Paschen; C. Hautmann; M. Betz
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Paper Abstract

Recent experiments have revealed the possibility to optically orient both electron and hole spins in bulk germanium. Here we discuss the wavelength dependence of this spin injection process using time-resolved Faraday rotation. Significant hole spin polarization is found only when addressing indirect optical transitions. In contrast, electron spins can be oriented via both direct and indirect optical transitions and even with excess energies much larger than the spin-orbit coupling energy. For photon energies very close to the indirect bandgap, we find indications that the degree of electron spin polarization is significantly enhanced - a trend in line with theoretical predictions.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8984, Ultrafast Phenomena and Nanophotonics XVIII, 898418 (7 March 2014); doi: 10.1117/12.2037597
Show Author Affiliations
J. Lohrenz, Technische Univ. Dortmund (Germany)
T. Paschen, Technische Univ. Dortmund (Germany)
C. Hautmann, Technische Univ. Dortmund (Germany)
M. Betz, Technische Univ. Dortmund (Germany)

Published in SPIE Proceedings Vol. 8984:
Ultrafast Phenomena and Nanophotonics XVIII
Markus Betz; Abdulhakem Y. Elezzabi; Jin-Joo Song; Kong-Thon Tsen, Editor(s)

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