Titre :

Quantum dot inter-Coulombic decay in two dimensions

Auteur(s) :

Haller, Anika [Orateur]
Freie Universität Berlin
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH = Helmholtz Centre Berlin for Materials and Energy = Centre Helmholtz de Berlin pour les matériaux et l'énergie [HZB]
Peláez, Daniel [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]
Bande, Annika [Auteur]
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH = Helmholtz Centre Berlin for Materials and Energy = Centre Helmholtz de Berlin pour les matériaux et l'énergie [HZB]

Titre de la manifestation scientifique :

High Dimensional Quantum Dynamics (HDQD)

Ville :

Lille

Pays :

France

Date de début de la manifestation scientifique :

2018-08-28

Date de publication :

2018-08-28

Discipline(s) HAL :

Chimie/Chimie théorique et/ou physique
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

Résumé en anglais : [en]

We theoretically study the electron dynamics for systems consisting of two singly charged and non-coupled quantum dots (QD). The so-called inter-Coulombic decay (ICD) can be observed as the efficient and dominant decay of ...
Lire la suite >We theoretically study the electron dynamics for systems consisting of two singly charged and non-coupled quantum dots (QD). The so-called inter-Coulombic decay (ICD) can be observed as the efficient and dominant decay of the resonance state into the ground state, in which the Coulomb interaction induces an ultrafast energy transfer between both sites causing excitation from one QD into the continuum, while relaxation into a lower bound state of the second QD can be observed. It has been shown so far for QDs that share a single continuum direction and strong confinement in the other two spatial dimensions [1-4]. Lately, we added a second continuum direction that opens up the applicability in a further group of material systems, namely laterally arranged self-assembled QDs. We find two resonances each with excitation along one of the continuum directions. Both decay via ICD [5]. The crucial step is the efficient preparation of the resonance state, which we realize by resonant excitation with laser pulses [2-4]. In the two-dimensional continuum the effect of electric field polarization on the efficiency of ICD can now be analyzed. The antisymmetrized multiconfiguration time-dependent Hartree method (MCTDH) [6] serves as a space-resolved wavefunction ansatz and grid-based calculations are performed utilizing the Heidelberg MCTDH program [7]. The standard POTFIT method [8] that transforms general potential energy surfaces into product form as needed for MCTDH has turned out to be too memory demanding when calculating in two dimensions. Instead, we adopt the Multigrid POTFIT method [9] that yields satisfactory results within decent computation times.References:[1] A. Bande, K. Gokhberg, and L. S. Cederbaum, J. Chem. Phys. 135, 144112 (2011).[2] A. Bande, J. Chem. Phys. 138, 214104 (2013).[3] A. Haller, Y.-C. Chiang, M. Menger, E. F. Aziz, and A. Bande, Chem. Phys. 482, 135 (2017).[4] A. Haller and A. Bande, submitted to J. Chem. Phys.[5] A. Haller, D. Peláez, and A. Bande, in preparation.[6] U. Manthe, H.-D. Meyer, and L. S. Cederbaum, J. Chem. Phys. 97, 3199 (1992).[7] M. H. Beck, A. Jäckle, G. A. Worth, and H.-D. Meyer, Phys. Rep. 324, 1 (2000).[8] A. Jäckle and H.-D. Meyer, J. Chem. Phys. 104, 7974 (1996).[9] D. Peláez and H.-D. Meyer, J. Chem. Phys. 138, 014108 (2013).Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL