Phys. Rev. Lett. 77, 3657–3660 (1996)Nonequilibrium Dynamics in a Quasi-Two-Dimensional Electron Plasma after Ultrafast Intersubband ExcitationReceived 31 May 1996; published in the issue dated 21 October 1996 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. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.3657
DOI:
10.1103/PhysRevLett.77.3657
PACS:
78.47.+p, 42.65.Re, 73.20.Dx
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