Stark effect on the exciton spectra of vertically coupled quantum dots: horizontal field orientation and non-aligned dots

Abstract

We study the effect of an electric-field on an electron-hole pair in an asymmetric system of vertically coupled self-assembled quantum dots taking into account their non-perfect alignment. We show that the non-perfect alignment does not qualitatively influence the exciton Stark effect for the electric field applied in the growth direction, but can be detected by application of a perpendicular electric field. We demonstrate that the direction of the shift between the axes of non-aligned dots can be detected by rotation of a weak electric field within the plane of confinement. Already for a nearly perfect alignment the two-lowest energy bright exciton states possess antilocked extrema as function of the orientation angle of the horizontal field which appear when the field is parallel to the direction of the shift between the dot centers.

References in corpus (5)

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Engineering electron and hole tunneling with asymmetric InAs quantum dot molecules
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Anomalous quantum confined Stark effects in stacked InAs/GaAs self-assembled quantum dots
• Exciton and negative trion dissociation by an external electric field in vertically coupled quantum dots

Cited by in corpus (5)

• Coulomb mediated hybridization of excitons in artificial molecules
• Exciton spectra in vertical stacks of triple and quadruple quantum dots in an electric field
• Excitons in quantum dot molecules: Coulomb coupling, spin-orbit effects and phonon-induced line broadening
• Entanglement Dynamics of Molecular Exciton States in Coupled Quantum Dots
• Fine-structure splitting of exciton states in quantum dot molecules: symmetry and tunnel-coupling effects