The use of fs laser pulses to excite plasmas in semiconductors has become a major method for studying fast processes. The transition times from the Gamma valley to the satellite X and L valleys are comparable to the reciprocal of the frequency of the phonons involved, bringing into question the use of the standard perturbation-theory approaches. Our aim is to evaluate the time required to emit a phonon, either the intravalley LO or the intervalley, by a nearly-free electron in semiconductors. The leading idea of our work is that the so-called ''collision duration'' is related to the time required to build up correlation between the initial and final state, and then to destroy this correlation as the collision is completed. The calculations are developed using e nonequilibrium Green's function formalism, which allows us to evaluate explicitly the effects of the correlations in time.

Collision duration for polar optical and intervalley phonon scattering / Bordone, Paolo; D., Vasileska; D. K., Ferry. - STAMPA. - 1:(1996), pp. 433-436. (Intervento presentato al convegno Nith International Conference on Hot Carriers in Semiconductors (HCIS-9) tenutosi a Chicago nel 31 luglio-4 agosto).

Collision duration for polar optical and intervalley phonon scattering

BORDONE, Paolo;
1996

Abstract

The use of fs laser pulses to excite plasmas in semiconductors has become a major method for studying fast processes. The transition times from the Gamma valley to the satellite X and L valleys are comparable to the reciprocal of the frequency of the phonons involved, bringing into question the use of the standard perturbation-theory approaches. Our aim is to evaluate the time required to emit a phonon, either the intravalley LO or the intervalley, by a nearly-free electron in semiconductors. The leading idea of our work is that the so-called ''collision duration'' is related to the time required to build up correlation between the initial and final state, and then to destroy this correlation as the collision is completed. The calculations are developed using e nonequilibrium Green's function formalism, which allows us to evaluate explicitly the effects of the correlations in time.
1996
Nith International Conference on Hot Carriers in Semiconductors (HCIS-9)
Chicago
31 luglio-4 agosto
1
433
436
Bordone, Paolo; D., Vasileska; D. K., Ferry
Collision duration for polar optical and intervalley phonon scattering / Bordone, Paolo; D., Vasileska; D. K., Ferry. - STAMPA. - 1:(1996), pp. 433-436. (Intervento presentato al convegno Nith International Conference on Hot Carriers in Semiconductors (HCIS-9) tenutosi a Chicago nel 31 luglio-4 agosto).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/617455
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