Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 25: Interatomic and intermolecular Coulombic decay (contributed for SYCD in A, MO)

MO 25.5: Talk

Thursday, March 21, 2013, 15:15–15:30, B 302

Interatomic Coulombic Electron Capture in Double Quantum Dots — •Federico M. Pont, Annika Bande, Kirill Gokhberg, and Lorenz S. Cederbaum — Theoretische Chemie, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany

We demonstrate that Interatomic Coulombic Electron Capture (ICEC) is possible in double quantum dots. It was first proposed for atomic dimers and is a process were one electron is captured by one of the atoms and the released energy is used to ionize the neighboring atom. ICEC is related to the Inter Coulombic Decay (ICD) processes, and it can be conceptualized using a virtual photon mechanism as well, but it is not a resonant process. The model used consists of two aligned dots separated by a distance R in a quasi-onedimensional nanowire. We are interested in a regime where the dots are not identical, they have only one bound state each, and the separation R is long enough to prevent electrons from tunneling between them. Since ICEC is not a resonant process, it can be in principle accessible in a wide range of energies. However we have found that in the quasi-onedimensional regime, the process shows enhancements for some definite values of the incoming electron momentum. In this case the reaction probability for ICEC was estimated to be of the order of 1%. Another ICEC related process was analyzed by allowing one of the dots to have one more bound state. In this setup a delocalized resonance between dots, which can decay through ICD, aids the process and a huge increase in the reaction probability is found reaching values up to 35%.