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Electron and hole confinement in stacked self-assembled InP dots of different sizes

Research output: Contribution to journalJournal article

Published

  • M Hayne
  • Jochen Maes
  • Yvonne M Manz
  • Oliver G Schmidt
  • Karl Eberl
  • Victor V Moshchalkov
Journal publication date03/2001
JournalPhysica Status Solidi (B)
Journal number1
Volume224
Number of pages5
Pages31-35
Original languageEnglish

Abstract

We report photoluminescence (PL) measurements on doubly-stacked Layers of self-assembled InP quantum dots. The amount of material in the lower layer is kept constant. whilst in the upper layer it is systematically reduced. Zero-field PL measurements demonstrate that for each stack only one dot (the largest one) is occupied by an electron, and that when the amount of InP in both layers is the same the upper dots are larger. The behaviour of the holes, which art: confined by strain in the structure. is revealed by high field (50 T) PL experiments. The holes are found to be increasingly localised to a smaller and smaller volume as the size of the dots in the upper layer is reduced.