Nonequilibrium dynamics in a quasi-two-dimensional electron plasma after ultrafast intersubband excitation

Stephan Lutgen, Robert A. Kaindl, Michael Woerner, Thomas Elsaesser, Andreas Hase, Harald Künzel, Mario Gulia, Duilio Meglio, Paolo Lugli

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The dynamics of electrons in GaInAs/AlInAs quantum wells is studied after excitation from the n = 1 to the n = 2 conduction subband. Femtosecond pump-probe experiments demonstrate for the first time athermal distributions of n = 1 electrons on a surprisingly long time scale of 2 ps. Thermalization involves intersubband scattering of excited electrons via optical phonon emission with a time constant of 1 ps and intrasubband Coulomb and phonon scattering. Ensemble Monte Carlo simulations show that the slow electron equilibration results from Pauli blocking and screening of carrier-carrier scattering.

Original languageEnglish (US)
Pages (from-to)3657-3660
Number of pages4
JournalPhysical Review Letters
Volume77
Issue number17
DOIs
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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