Generation of coherent terahertz radiation by polarized electron-hole pairs in GaAs/AlGaAs quantum wells

Journal Article · Fri Nov 15 00:00:00 EST 2013 · Semiconductors

DOI:https://doi.org/10.1134/S1063782613110031· OSTI ID:22210453

Alekseev, P. S.; Klimko, G. V.; Ivanov, S. V.; Shcheglov, V. L.; Sedova, M. A.; Zakhar'in, A. O. ^[1]

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1. Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

The generation of coherent terahertz radiation upon the band-to-band femtosecond laser photoexcitation of GaAs/AlGaAs multiple-quantum-well structures in a transverse electric field at room temperature is investigated. The properties of the observed terahertz radiation suggest that it is generated on account of the excitation of a time-dependent dipole moment as a result of the polarization of nonequilibrium electron-hole pairs in quantum wells by the electric field. The proposed theoretical model taking into account the dynamic screening of the electric field in the quantum wells by nonequilibrium charge carriers describes the properties of the observed terahertz signal.

• OSTI ID: 22210453
• Journal Information: Semiconductors, Vol. 47, Issue 11; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ALUMINIUM ARSENIDES
DIPOLE MOMENTS
ELECTRIC FIELDS
GALLIUM ARSENIDES
LASERS
POLARIZATION
QUANTUM WELLS