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Topological Matter Conference (TMC) 2021: Atomic-scale spin textures in model-type systems studied with spin-polarized STM
By Kirsten von Bergmann, University of Hamburg

Non-collinear magnetic order arises due to competition of different magnetic interactions. Often the dominant interaction is the exchange between neighboring atomic magnetic moments. An additional sizable exchange interaction to more distant magnetic moments, or a contribution from anisotropic exchange (DMI), typically lead to spin spiral ground states in the absence of magnetic fields. However, also metastable zero-field skyrmions in a ferromagnetic surrounding can arise, as found for the system of Rh/Co/Ir(111).

In contrast, higher-order interactions can give rise to two-dimensionally modulated magnetic states on the atomic scale that are the ground states even at zero magnetic field. Different examples of such atomic-scale non-collinear magnetic order will be presented, namely the rowwise antiferromagnet and the triple-Q state in Mn monolayers on Re(0001), and the uniaxial and hexagonal magnetic states found in Fe/Rh/Ir(111) (Fig. 1), and the driving forces will be discussed.

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The Topological Matter Conference (TMC) focuses on recent developments in fundamental and applied aspects of broad classes of topological quantum systems and the synergy between them. Topics include topological insulators and Weyl semimetals, topological phononics and photonics, skyrmions, quantum metrology and more.

The TMC is a joint effort between the H2020 FET-PROACTIVE projects TOCHA (GA: 824140) and SKYTOP (GA: 824123) with the objective to establish synergies and to mobilize the Topological Matter community. Intended to lead to an annual gathering, the first TMC will be celebrated in 2021 from June 28th to July 2nd. If the pandemic situation allows it, the conference will be hosted at the Eden Roc hotel in Sant Feliu de Guixols, Spain, including Plenary, Invited, Oral and Poster contributions. Otherwise, the conference will be virtual, likely with no poster presentations.

For more information: https://topologicalmatter.org/program/