Narrow (≈4 meV) inhomogeneous broadening and its correlation with confinement potential of pyramidal quantum dot arrays

K. Leifer, E. Pelucchi, S. Watanabe, F. Michelini, B. Dwir, E. Kapon

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Abstract

The inhomogeneous broadening in the luminescence spectra of ordered arrays of pyramidal GaAsAlGaAs semiconductor quantum dots (QDs) was studied as a function of the dot size. Dot arrays with inhomogeneous broadening as small as 4.1 meV and a corresponding ground state to first excited state transition separation of 28 meV were obtained. By evaluating the QD energy levels using a multiband kp model, the authors estimated that the observed inhomogeneous broadening corresponds to dot height fluctuations of about 1-2 ML across the array.

Original languageEnglish
Article number081106
JournalApplied Physics Letters
Volume91
Issue number8
DOIs
Publication statusPublished - 2007 Aug 31
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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