Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 20: Resonant Energy Transfer and Interatomic Coulombic Decay I

MO 20.3: Talk

Thursday, March 8, 2018, 14:45–15:00, PA 1.150

Light induced inter-Coulombic decay in quantum dots controled via laser focus, field strength, and polarization — •Anika Haller and Annika Bande — Institute of Methods for Material Development, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany

The inter-Coulombic decay (ICD), an ultrafast energy transfer process induced by long-range electron correlation, has been shown to take place in pairs of atom-like nanostructures, namely quantum dots (QD). We theoretically investigate the electron dynamics for a system of two singly-charged non-coupled GaAs QDs. After resonant excitation by a laser pulse the system efficiently decays from its resonance excited state via ICD: inter-QD energy transfer causes excitation of one electron from one QD into the continuum, while the other relaxes to a lower bound state of the other QD. We show the field strength dependence of the ICD initiation including a changing number of Rabi oscillations during population. In addition, we study the impact of the laser focus on the second, direct ionization channel. Furthermore, we analyze the effect of electric field polarization on the efficiency of ICD, and thus open up the applicability in a further group of material systems. A space-resolved wavefunction ansatz is applied by means of the antisymmetrized multiconfiguration time-dependent Hartree method (MCTDH). A state-resolved representation has been developed as an alternative approach, which lets us conclude on the importance of multi-photon processes.