Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 55: Quantum dots: Interaction with environment

HL 55.2: Vortrag

Mittwoch, 18. März 2015, 15:15–15:30, EW 203

Geometrical Control of the Interatomic Coulombic Decay Process in Quantum Dots — Praphasiri Dolbundalchok¹ and •Annika Bande^1,2 — ¹Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany — ²Institute of Methods for Material Development, Helmholtz-Zentrum Berlin and Joint Lab JuLiq with Department of Physics, FU Berlin, Albert-Einstein-Str. 15, 12489 Berlin, Germany

The elementary physical process of interatomic Coulombic decay (ICD) is recognized as an ultrafast energy transfer process between atoms and molecules induced by long range electron correlation. It was shown to be also possible in arrays of semiconductor quantum dots (QDs). An electron bound to an excited state of one of the QDs decays by transferring its energy to the neighboring QD from which a second electron is emitted.

Different from atomic ICD, ICD in QDs is postulated to find technological application either in infrared photo detectors or solar cells. Most appealing for this technological use is that by geometry variation of the QDs the ICD rate can be controlled.

In this work we present the control of the two-electron ICD process by geometry variation of QDs represented by electron binding potentials in electron dynamics calculations with the highly accurate multiconfiguration time-dependent Hartree (MCTDH) method for antisymmetric electronic wave functions.