Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 33: Poster Session II

A 33.43: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal

Polarisation Dynamics of Many-body Systems Dynamically Polarised via the Cross Effect — •Federica Raimondi, Daniel Wisniewski, Alexander Karabanov, Walter Kockenberger, Igor Lesanovsky, and Juan Garrahan — University of Nottingham

Dynamic Nuclear Polarisation (DNP) provides significant signal enhancement compared to conventional thermal polarisation techniques used in typical nuclear magnetic resonance applications. Of the possible DNP mechanisms, the cross effect (CE), involving triple spin-flips between two interacting electrons and a nucleus, is most efficient at low temperatures and microwave irradiation amplitude of the first electron. In order to examine the dependence of CE polarisation dynamics on the system geometry, large-scale simulations must be carried out. This becomes impracticable using the full Liouville-von-Neumann description of the system. We have developed a new formalism that separates the dynamics of the system into fast and slow, allowing projection onto the Zeeman subspace, thereby greatly reducing the state-space of the system. Under given conditions, it is then possible to simulate the Zeeman Projected polarisation dynamics using classical kinetic Monte Carlo methods. With this approach, a system of 118 proton spins has been simulated.