Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 47: Electronic Structure of Surfaces: Magnetism and Spin Phenomena

O 47.2: Poster

Tuesday, March 21, 2017, 18:30–20:30, P1A

A Riccati equation based model for chiral spin filters — •Daniel Nürenberg, Matthias Kettner, and Helmut Zacharias — Physikalisches Institut, Uni Münster, Germany

The spin selective transport of electrons in chiral molecules is currently under intense research in theory and experiment. These experiments include studies of the dependence of the spin polarization on the length of the molecules and on the starting spin polarization from the substrate. We show that the evolution of the spin polarization of an ensemble of electrons during propagation can be described by a Riccati equation, which can be fitted to experimental data. We propose that the coefficients in this model are suitable to characterize the efficiency of spin filters and help to distinguish spin-flip and perturbation from spin-dependent extinction effects. These perturbations also limit the spin polarization for long molecules. We apply our model to fit previous experimental data from DNA, oligopeptides and [7]-helicene.