Polarization dependent photocurrent spectroscopy of InAs/GaAs quantum dots

L. Chu, M. Arzberger, A. Zrenner, G. Böhm, G. Abstreiter

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

We have performed interband photocurrent spectroscopy on self-assembled InAs/GaAs quantum dots using a graded index separate confinement heterostructure in waveguide geometry. The photocurrent spectrum of the quantum dots is found to be shifted to higher energies in comparison to the photoluminescence spectrum. The polarization dependent measurements show that the valence band ground states of strained InAs islands have heavy hole character. In a structure with seven vertically stacked quantum dot layers separated by 10 nm GaAs spacers, we find a change in the photocurrent spectra which is evidence for vertical coupling.

Original languageEnglish
Pages (from-to)2247-2249
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number15
DOIs
StatePublished - 11 Oct 1999

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