Capture and release of carriers in InGaAs/GaAs quantum dots

D. Turchinovich, P. Porte, N. Daghestani, K. G. Wilcox, E.U. Rafailov, P. Uhd Jepsen

    Research output: Contribution to journalArticle

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    Abstract

    We observe the ultrafast capture and release of charge carriers in InGaAs/GaAs quantum dots (QDs) at room-temperature with time-resolved terahertz spectroscopy. For excitation into the barrier states, a decay of the photoinduced conductivity, due to capture of carriers into the nonconducting QD states is observed. The increase of the decay time constant with increasing pump fluence is attributed to filling of the QD states. In the case of resonantly excitation into the QD ground state a maximum conductivity is reached 35 ps after photoexcitation, which is assigned to the release of carriers from the QDs into the wetting layer and barrier states.
    Original languageEnglish
    JournalJournal of Physics: Conference Series
    Volume193
    DOIs
    Publication statusPublished - 1 Jan 2009

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    quantum dots
    conductivity
    decay
    photoexcitation
    time constant
    wetting
    excitation
    charge carriers
    fluence
    pumps
    ground state
    room temperature
    spectroscopy

    Cite this

    Turchinovich, D. ; Porte, P. ; Daghestani, N. ; Wilcox, K. G. ; Rafailov, E.U. ; Uhd Jepsen, P. / Capture and release of carriers in InGaAs/GaAs quantum dots. In: Journal of Physics: Conference Series. 2009 ; Vol. 193.
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    Capture and release of carriers in InGaAs/GaAs quantum dots. / Turchinovich, D.; Porte, P.; Daghestani, N.; Wilcox, K. G.; Rafailov, E.U.; Uhd Jepsen, P.

    In: Journal of Physics: Conference Series, Vol. 193, 01.01.2009.

    Research output: Contribution to journalArticle

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    AU - Turchinovich, D.

    AU - Porte, P.

    AU - Daghestani, N.

    AU - Wilcox, K. G.

    AU - Rafailov, E.U.

    AU - Uhd Jepsen, P.

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    AB - We observe the ultrafast capture and release of charge carriers in InGaAs/GaAs quantum dots (QDs) at room-temperature with time-resolved terahertz spectroscopy. For excitation into the barrier states, a decay of the photoinduced conductivity, due to capture of carriers into the nonconducting QD states is observed. The increase of the decay time constant with increasing pump fluence is attributed to filling of the QD states. In the case of resonantly excitation into the QD ground state a maximum conductivity is reached 35 ps after photoexcitation, which is assigned to the release of carriers from the QDs into the wetting layer and barrier states.

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