Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 32: Quantum dots and wires: Optical properties II
HL 32.5: Vortrag
Mittwoch, 14. März 2018, 16:00–16:15, A 151
Atomistic pseudopotential calculations of the excitonic fine structure of InP and CdSe quantum dots — •Hanh Bui1,2, Anastasia Karpulevich1,2, and Gabriel Bester1,2 — 1Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, D-20146 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany
Using the atomic effective pseudopotentials (AEPs) [1,2] and a small modification of the non-local part of pseudopotential to obtain the correct band-gaps, we perform the screened configuration interaction (CI) calculations and study the exciton fine structure of InP and CdSe quantum dots with hundreds to thousands of atoms. The strong confinement of particles in quantum dots enhances the electron-hole exchange interaction which splits the band-edge exciton into bright and dark exciton states, resulting in the so-called exciton fine structure. Our results fit well with experimental data.
[1] J. R. Cardenas and G. Bester, Phys. Rev. B 86, 115332 (2012).
[2] A. Karpulevich, H. Bui, D. Antonov, P. Han, G. Bester, Phys. Rev. B 94, 205417 (2016).