Ultrafast dephasing of coherent intersubband polarizations in a quasi-two-dimensional electron plasma

Robert A. Kaindl, Stephan Lutgen, Michael Woerner, Thomas Elsaesser, Bernd Nottelmann, Vollrath Martin Axt, Tilmann Kuhn, Andreas Hase, Harald Künzel

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

We present the first study of coherent intersubband polarizations in a pure electron plasma by femtosecond four-wave mixing in the midinfrared. Resonantly excited polarizations between consecutive conduction subbands of narrow GaInAs/AlInAs quantum wells decay within about 500 fs, much faster than intersubband relaxation of electrons. The relation between the decay rate of the signals and the dephasing rate is analyzed by solving the time-dependent Hartree-Fock equations for the single-particle density matrix. Electron-electron scattering is identified as the main dephasing mechanism.

Original languageEnglish (US)
Pages (from-to)3575-3578
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number16
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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