Ultrafast relaxation of hot electrons in quantum wires

Vladimir V. Mitin; Remis Gaska; R. Mickevicius

doi:10.1117/12.175911

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6 May 1994 Ultrafast relaxation of hot electrons in quantum wires

Vladimir V. Mitin, Remis Gaska, R. Mickevicius

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Proceedings Volume 2142, Ultrafast Phenomena in Semiconductors; (1994) https://doi.org/10.1117/12.175911
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Ensemble Monte Carlo simulations of hot nonequilibrium electron relaxation in rectangular GaAs quantum wires is carried out. The simulations demonstrate that the initial stage of hot photoexcited electron cooling dynamics is determined by cascade emission of optical phonons. The second relaxation stage is controlled by inelastic electron interaction with acoustic phonons and exhibits strong dependence on the cross-section of a quantum wire. If electron concentration exceeds 10⁵ cm^-1 nonequilibrium (hot) phonon effects come into play and hot phonon thermalization time defines the characteristic electron gas cooling time. In contrast to bulk materials and quantum wells, hot phonon effects in quantum wires are strongly dependent on the initial broadening of energy distribution of photoexcited electrons.

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Vladimir V. Mitin, Remis Gaska, and R. Mickevicius "Ultrafast relaxation of hot electrons in quantum wires", Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); https://doi.org/10.1117/12.175911

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