Sonderseminare TRR80

25.10.2017 16:00, Raum: R-242
Dr. Peter Milde (TU Dresden, Institute of Applied Physics, Dresden)
Scanning Force Microscopy Investigations of Skyrmions

In the past decade, a lot of interest was spurred by discoveries of vortex-like magnetic states, so-called skyrmions, in a variety of materials characterized by the anisotropic Dzyaloshinskii-Moriya (DM) interaction. Originally introduced in the context of pion fields, the expression skyrmion today is used in a more general sense as a term for a mathematical construct, that describes a topologically stabilized, particle-like object. The topological nature of the skyrmions gives rise to new and exciting physics, such as the so-called topological protection, i.e. an increased stability against the superparamagnetic effect, as well as the topological Hall-effect, or the Skyrmion Hall-effect. Real-space imaging of these objects, especially on single crystals, is readily achieved using magnetic force microscopy. We review our scanning force microscopy investigations of skyrmions in direction bulk-DMI single crystal materials, such as FexCo(1-x)Si (x = 0:5), GaV4S8 and Cu2OSeO3 and report on recent findings.

26.10.2017 14:00, Raum: S-254
Prof. Dr. Vasily Moshnyaga (Georg-August-Universität Göttingen, Germany)
Order / disorder phenomena in perovskite films
14.11.2017 16:00, Raum: S-288
Dr. Martin Hohenadler (Universität Würzburg)
Competing Orders in Luttinger and Dirac Liquids
15.11.2017 15:30, Raum: S-403
Dr. Dirk Wulferding (Institute for Condensed Matter Physics, TU Braunschweig and Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, POSTECH, Korea)
Magnetic force microscopy beyond imaging - from low energy condensed matter physics to high energy particle physics
28.11.2017 17:00, Raum: S-288
Prof. Dr. Björn Trauzettel (Universität Würzburg)
Chiral anomaly and fractional charges at the quantum spin Hall edge
11.12.2017 15:45, Raum: S-288
Prof. Avinash Mahajan (Indian Institute of Technology Bombay, Mumbai (India))
Gapless spin liquid behaviour in the S = 1 honeycomb ruthenate Ag3LiRu2O6