Dr.jens.brede

When a single magnetic adatom is deposited on a surface of a metal, it affects the charge and spin texture of the electron gas surrounding it. The screening of the local moment by conduction electrons gives rise to the Kondo effect. Here we investigate the effect of the Rashba spin orbit coupling on the local magnetization density of states (LMDOS) around a Cobalt impurity on a Au(111) surface in a magnetic field. We show that the in-plane component of the LMDOS is exclusively associated with the Rashba spin orbit interaction. This observation can be experimentally exploited to confirm the presence of the Rashba effect on surfaces, such as Au(111), by performing spin-polarized STM measurements around the Kondo impurity.

Stepwise self-assembly of C60 mediated by atomic scale moiré magnifiers

Nature Communications 4, 1679 (2013). doi:10.1038/ncomms2706

Authors: D.V. Gruznev, A.V. Matetskiy, L.V. Bondarenko, O.A. Utas, A.V. Zotov, A.A. Saranin, J.P. Chou, C.M. Wei, M.Y. Lai & Y.L. Wang

Author(s): Simon Holzberger, Tobias Schuh, Stefan Blügel, Samir Lounis, and Wulf Wulfhekel

We investigate the ground states of antiferromagnetic Mn nanochains on Ni(110) by spin-polarized scanning tunneling microscopy in combination with theory. While the ferrimagnetic linear trimer experimentally shows the predicted collinear classical ground state, no magnetic contrast was observed for ...

[Phys. Rev. Lett. 110, 157206] Published Wed Apr 10, 2013

Author(s): A. Chiesa, S. Carretta, P. Santini, G. Amoretti, and E. Pavarini

We present a flexible and effective ab initio scheme to build many-body models for molecular nanomagnets, and to calculate magnetic exchange couplings and zero-field splittings. It is based on using localized Foster-Boys orbitals as a one-electron basis. We apply this scheme to three paradigmatic sy...

[Phys. Rev. Lett. 110, 157204] Published Tue Apr 09, 2013

Author(s): L. Serrier-Garcia, J. C. Cuevas, T. Cren, C. Brun, V. Cherkez, F. Debontridder, D. Fokin, F. S. Bergeret, and D. Roditchev

The proximity effect between a superconductor and a highly diffusive two-dimensional metal is revealed in a scanning tunneling spectroscopy experiment. The in situ elaborated samples consist of superconducting single crystalline Pb islands interconnected by a nonsuperconducting atomically thin disor...

[Phys. Rev. Lett. 110, 157003] Published Tue Apr 09, 2013

The rates of a hindered molecular rotation induced by tunneling electrons are evaluated using scattering theory within the sudden approximation. Our approach explains the excitation of copper phthalocyanine molecules (CuPc) on Cu(111) as revealed in a recent measurement of telegraph noise in a scanning tunneling microscopy (STM) experiment [Schaffert \textit{et al.}, Nat. Mat. {\bf 12}, 223 (2013)]. A complete explanation of the experimental data is performed by computing the geometry of the adsorbed system, its electronic structure and the energy transfer between tunneling electrons and the molecule's rotational degree of freedom. The results unambiguously show that tunneling electrons induce a frustrated rotation of the molecule. In addition, the theory determines the spatial distribution of the frustrated rotation excitation, confirming the striking dominance of two out of four molecular lobes in the observed excitation process. This lobe selectivity is attributed to the different hybridizations with the underlying substrate.

Author(s): O. I. Arillo-Flores, M. M. Fadlallah, C. Schuster, U. Eckern, and A. H. Romero

The magnetic and electronic properties of metal phthalocyanines (MPc) and fluorinated metal phthalocyanines (F₁₆MPc) are studied by means of spin density functional theory (SDFT). Several metals (M) such as Ca, all first d-row transition metals, and Ag are investigated. By considering different open...

[Phys. Rev. B 87, 165115] Published Tue Apr 09, 2013

Nature Physics. doi:10.1038/nphys2548

Authors: Sabine Steil, Nicolas Großmann, Martin Laux, Andreas Ruffing, Daniel Steil, Martin Wiesenmayer, Stefan Mathias, Oliver L. A. Monti, Mirko Cinchetti & Martin Aeschlimann