Evolution from individual to collective electron states in a dense quantum dot ensemble

M. V. Artemyev, A. I. Bibik, L. I. Gurinovich, S. V. Gaponenko, and U. Woggon
Phys. Rev. B 60, 1504 – Published 15 July 1999
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Abstract

Absorption spectrum of a quantum dot ensemble was found to exhibit a systematic modification with dot concentration from a set of discrete subbands inherent in isolated nanocrystals to a smooth band-edge absorption similar to that of bulk semiconductors. The results are interpreted in terms of an evolution from individual (localized) to collective electron states delocalized within at least a finite number of nanocrystals. The observed behavior is considered as a possible precursor of the Anderson transition in a quantum dot ensemble, i.e., a transition from localized electron states to states that are delocalized over a macroscopically large number of nanocrystals.

  • Received 4 November 1998

DOI:https://doi.org/10.1103/PhysRevB.60.1504

©1999 American Physical Society

Authors & Affiliations

M. V. Artemyev

  • Institute for Physico-Chemical Problems, Belarusian State University, Minsk 220080, Belarus

A. I. Bibik, L. I. Gurinovich, and S. V. Gaponenko*

  • Institute of Molecular and Atomic Physics, National Academy of Sciences, Minsk 220072, Belarus

U. Woggon

  • Physics Department, University of Dortmund, Otto-Hahn-Strasse 4, 44221 Dortmund, Germany

  • *Author to whom correspondence should be addresssed. Electronic address: gaponen@imaph.bas-net.by, http://imaph.bas-net.by

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Vol. 60, Iss. 3 — 15 July 1999

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