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Influence of LO-phonon emission on bloch oscillations in semiconductor superlattices

Einfluß von LO-Phononenemission auf Bloch-Oszillationen in Halbleiter-Übergittern


Physica status solidi. B 204 (1997), pp.83-86 : Ill., Lit.
ISSN: 0031-8957
ISSN: 0370-1972
Journal Article
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductor; optical measurement; optische Messung; superlattice; Übergitter

The intraband phase coherence of electronic Bloch wavepackets in semiconductor superlattices is partially conserved when electrons undergo energy relaxation by LO-phonon emission. The decay time of the intraband coherence as probed by terahertz-emission spectroscopy is found to be unaffected by excitation below or above the threshold for LO-phonon emission. On the other hand, the population relaxation probed by femtosecond optical transmission spectroscope is drastically accelerated when the threshold is reached. Electrons which have undergone LO-phonon emission form a more localized distribution in k-space giving rise to a stronger THz signal.