logo icmab ochoa 02 01 logo icmab ochoa 02 01
  • SCIENTIFIC HIGHLIGHTS

Strain-induced fundamental optical transition in (In,Ga)As/GaP quantum dots

Imagen1

C. RobertM. O. NestoklonK. Pereira da SilvaL. PedesseauC. CornetM. I. AlonsoA. R. GoñiP. TurbanJ.-M. JancuJ. Even and O. Durand.

Appl. Phys. Lett. 104, 011908 (2014)

http://dx.doi.org/10.1063/1.4861471

The nature of the ground optical transition in an (In,Ga)As/GaP quantum dot is thoroughly investigated through a million atoms supercell tight-binding simulation. Precise quantum dotmorphology is deduced from previously reported scanning-tunneling-microscopy images. The strain field is calculated with the valence force field method and has a strong influence on the confinement potentials, principally, for the conduction band states. Indeed, the wavefunction of the ground electron state is spatially confined in the GaP matrix, close to the dot apex, in a large tensile strain region, having mainly Xz character. Photoluminescence experiments underhydrostatic pressure strongly support the theoretical conclusions.

 

See more posts on ICMAB related to: Materials for information science and electronics
See more posts on ICMAB related to: Katiane Pereira , Isabel Alonso , Alejandro Goñi , Quantum dots , III-V semiconductors

Related Topics: Materials for information science and electronics

Also on ICMAB...

Search