ISBN 9783843939461

978-3-8439-3946-1, Reihe Physik

Stefan Sold
Ultrafast spin dynamics in ligand-stabilized complexes

263 Seiten, Dissertation Technische Universität Kaiserslautern (2018), Softcover, A5

Zusammenfassung / Abstract

In today's digital world the need for higher data density and molecular logic operations keeps growing. On the long run the conventional semiconductor-based technology, which still dominates the field, will ultimately reach its physical limits. The spin-based technology called (nano)-spintronics provides a promising alternative which can possibly satisfy those increased demands.

More specifically, quantum logic operations on basis of laser-induced spin dynamics are proposed in this thesis. To this end a realistic two-dimensional magnetic system consisting of four nickel atoms is employed. Further, aspects of quantum thermodynamics are taken into account and the impact of a bath coupling on the dynamics is investigated. The results demonstrate that an ineffective laser pulse can indeed lead to a spin flip scenario if it is combined with a thermal coupling and a distortion of the structure (e.g., phonon induced). This is called the spin emergent effect.

Furthermore, spin dynamics on the real synthesized four-magnetic-center complex Dy2Ni2L4 is presented, where L is the double deprotonated Schiff-base ligand ((E)-2-Hydroxy-3-methoxybenzylideneamino)phenol. Both, the realistic as well as the real structure, are calculated with high correlated ab initio quantum chemistry methods. The theoretical results for the real complex are compared with the experimental data.