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Homogeneous Width of Confined Excitons in Quantum Dots — Experimental

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Semiconductor Quantum Dots

Part of the book series: NanoScience and Technology ((NANO))

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Abstract

A quantum dot has quantized energy levels that show a size-dependent blue-shift as a result of the quantum confinement effect. The quantized levels have been generally believed to be as sharp as the 5-function, reflecting its atomic character and size. Other inhomogeneities in the ensemble of quantum dots are considered to make the optical spectrum of the levels broad. However, this consideration is oversimplified. As a result of unique dephasing mechanisms in quantum dots, the homogeneous width of quantum dots is not so sharp as the σ-function, but is found to be finite and is sometimes broader than that of the bulk crystals. It is given by the inverse of dephasing time consisting of radiative lifetime, impurity or defect scattering time, surface or interface scattering time, phonon scattering time, and carrier-carrier scattering time at the excited states. Because electrons, excitons, and phonons are size-quantized in quantum dots, the electron-phonon and exciton-phonon interactions in quantum dots are unique. Temperature dependence of the homogeneous width reflects the unique temperature-dependent dephasing mechanisms of quantum states by phonons; their study is very important. Therefore the homogeneous linewidth of the optical spectra of quantum dots is one of the most important characters of quantum dots.

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Authors
  1. Yasuaki Masumoto
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Editors and Affiliations

  1. Institute of Physics, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki, 305-8571, Japan

    Yasuaki Masumoto

  2. Department of Electonics and Information Science, Kyoto Institute of Technology, Hashigami-cho, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan

    Toshihide Takagahara

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Masumoto, Y. (2002). Homogeneous Width of Confined Excitons in Quantum Dots — Experimental. In: Masumoto, Y., Takagahara, T. (eds) Semiconductor Quantum Dots. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05001-9_8

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  • DOI: https://doi.org/10.1007/978-3-662-05001-9_8

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-07675-6

  • Online ISBN: 978-3-662-05001-9

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