Carrier dynamics of the intermediate state in InAs/GaAs quantum dots coupled in a photonic cavity under two-photon excitation

Takashi Kita, Tsuyoshi Maeda, and Yukihiro Harada
Phys. Rev. B 86, 035301 – Published 2 July 2012

Abstract

We have studied the time-resolved intraband transition from the intermediate state to the continuum state of the conduction band in InAs/GaAs self-assembled quantum dots (QDs) embedded in a one-dimensional photonic cavity structure using two-color photoexcitation spectroscopy. The resonant energy of the photonic cavity was tuned to enhance the intraband transition with an energy smaller than the interband transition energy between the intermediate state and the quantized hole states. The interband photoluminescence intensity was observed to be drastically reduced due to the pumping out of carriers in the intermediate state using near-infrared laser light. We proposed a model describing the carrier relaxation process in the InAs/GaAs QD system, where the two-photon absorption and the Pauli blocking in QDs are considered.

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  • Received 24 February 2012

DOI:https://doi.org/10.1103/PhysRevB.86.035301

©2012 American Physical Society

Authors & Affiliations

Takashi Kita, Tsuyoshi Maeda, and Yukihiro Harada

  • Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan

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Issue

Vol. 86, Iss. 3 — 15 July 2012

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