Sub-wetting layer continuum states in the self-organized quantum dot samples


In polar semiconductor samples of the self-organized quantum dots, grown by the Stranski-Krastanow growth method, the lowest-energy extended states of the motion of the electronic excitations, are assumed to be the wetting-layer states. The coupling between these extended states and the electronic states localized in the individual quantum dots, may influence the optical spectra of such samples in the sub-wetting layer region of energy. This effect is studied assuming the Fröhlich's coupling between the electrons and the polar optical phonons. The contribution of this interaction to the appearance of the sub-wetting layer continuum in the optical spectra, and to the level broadening of the localized states, pointed out in some experiments, is estimated.

This is a preview of subscription content, access via your institution.


  1. [1]

    A. D. Yoffe, Adv. Phys. 50, 1 (2001).

    CAS  Article  Google Scholar 

  2. [2]

    K. Krai and Z. Khás, Physica B 272, 15 (1999).

    Article  Google Scholar 

  3. [3]

    M.K.K. Nakaema, M.J.S.S. Brasil, F. Iikawa, E. Ribeiro, T. Heinzel, K. Ensslin, G. Medeiros-Ribeiro, P.M. Petroff and J. A. Brum, Physica E 12, 872 (2002).

    CAS  Article  Google Scholar 

  4. [4]

    Y. Toda, O. Moriwaki, M. Nishioka and Y. Arakawa, Phys. Rev. Lett. 82, 4114 (1999).

    CAS  Article  Google Scholar 

Download references


The work was supported by the grants IAA1010113, OCP5.20, RN19982003014 and by the project AVOZ1-010-914.

Author information



Corresponding author

Correspondence to K. Král.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Král, K., Zdeněk, P., Khás, Z. et al. Sub-wetting layer continuum states in the self-organized quantum dot samples. MRS Online Proceedings Library 737, 131 (2002).

Download citation