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PGI-1 Talk: Dr. Jens Wiebe

Emulation of Spin Systems via Artificial Arrays of Magnetic Atoms

02 May 2018 11:30
PGI Lecture Hall

University of Hamburg


A transition metal atom adsorbed to the surface of a solid state material can serve as the spin building block for the STM-tip based assembly of arrays of hundreds of atoms (see the image) that can emulate the properties of a large variety of spin systems. Possible applications which are in the focus of modern solid state physics range from few atom bits, over spin chains and Kondo lattices to topologically superconducting systems if the transition metal atom array is assembled on a superconducting substrate. The usage of magnetic STM-tips furthermore enables to read out the spin state and the excitations of every atom in such an array in order to do a one-by-one comparison with effective spin models and density functional theory calculations.
Here, I will focus on our recent work on arrays of magnetic atoms assembled on high-Z normal metal substrates, where we have been able to use the Dzyaloshinskii–Moriya component of the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction in order to realize spin-spirals in dilute chains of atoms, stable magnetic bits of only few densely packed atoms, and complexes of such bits and RKKY coupled atoms revealing intriguing dynamical properties.
We acknowledge funding from the SFB668 and the GrK1286 of the DFG.


Prof. Dr. Samir Lounis
Phone: +49 2461 61-4068
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