Absence of correlation between built-in electric dipole moment and quantum Stark effect in single InAs/GaAs self-assembled quantum dots

Weidong Sheng, Jean Pierre Leburton

Research output: Contribution to journalArticle

Abstract

We report significant deviations from the usual quadratic dependence of the ground-state interband transition energy on applied electric fields in single InAs/GaAs self-assembled quantum dots. While earlier works have used conventional second-order perturbation theory to claim a negative dipole moment in the presence of external electric field, we show that this theory fails to correctly describe the Stark shift for electric field below F = 10 kV/cm in high dots. Eight-band k·p calculations demonstrate that this effect is predominantly due to the three-dimensional strain field distribution which for various dot shapes and stoichiometric compositions drastically affect the hole ground state.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number12
DOIs
StatePublished - Mar 19 2003

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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