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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

Optical orientation of electron spins and valence-band spectroscopy in germanium

Abstract

We have investigated optical orientation in the vicinity of the direct gap of bulk germanium. The electron spin polarization is studied via polarization-resolved photoluminescence excitation spectroscopy unfolding the interplay between doping and ultrafast electron transfer from the center of the Brillouin zone towards its edge. As a result, the direct-gap photoluminescence circular polarization can vary from 30% to −60% when the excitation laser energy increases. This study provides also simultaneous access to the resonant electronic Raman scattering due to inter-valence-band excitations of spin-polarized holes, yielding a fast spectroscopic approach for the determination of the energy spectrum of holes in semiconducting materials.
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hal-02052749 , version 1 (28-02-2019)

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  • HAL Id : hal-02052749 , version 1

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F. Pezzoli, Andrea Balocchi, E. Vitiello, Thierry Amand, Xavier Marie. Optical orientation of electron spins and valence-band spectroscopy in germanium. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 91 (20). ⟨hal-02052749⟩
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