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Special seminars TRR80


25.10.2017 4 p.m., room: R-242
Dr. Peter Milde (TU Dresden, Institute of Applied Physics, Dresden)
Scanning Force Microscopy Investigations of Skyrmions
26.10.2017 2 p.m., room: S-254
Prof. Dr. Vasily Moshnyaga (Georg-August-Universität Göttingen, Germany)
Order / disorder phenomena in perovskite films
14.11.2017 4 p.m., room: S-288
Dr. Martin Hohenadler (Universität Würzburg)
Competing Orders in Luttinger and Dirac Liquids
15.11.2017 3:30 p.m., room: 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

Magnetic force microscopy (MFM) - a scanning probe technique based on atomic force micros-copy - has established itself as a valuable tool to uncover magnetic domain structures and their formation on the sub-micrometer scale [1,2]. On the other hand, the magnetically coated tip can serve as a local probe to characterize important properties of superconducting samples. We have designed and constructed a low temperature, 3He magnetic force microscope operating within a three-axis vector magnet with field ranges of 2-2-9 T in x-y-z direction [3]. We demonstrate how to employ this system to investigate intrinsic properties of superconduc-tors, such as the pinning force of Abrikosov vortices, as well as the London penetration depth [4], which can yield valuable information about the superconducting gap symmetry. In addi-tion, we introduce the experimental realization of a model system to study quark confinement through Abrikosov vortices in superconductors [5].

[1] J. Jeong, et al., Phys. Rev. B 92, 054426 (2015). [2] D. Wulferding, et al., Sci. Rep. 7, 46296 (2017). [3] J. Yang, et al., Rev. Sci. Instrum. 87, 023704 (2016). [4] D. Wulferding, et al., Phys. Rev. B 92, 014517 (2015). [5] J. Yang, et al., in preparation.

28.11.2017 5 p.m., room: S-288
Prof. Dr. Björn Trauzettel (Universität Würzburg)
Chiral anomaly and fractional charges at the quantum spin Hall edge
30.11.2017 1:30 p.m., room: S-403
Dr. Leonid E. Svistov (P.L. Kapitza Institute for Physical Problems of Russian Academy of Sciences, Moscow)
Exotic phases in the triangular antiferromagnet CuCrO2
11.12.2017 3:45 p.m., room: S-288
Prof. Avinash Mahajan (Indian Institute of Technology Bombay, Mumbai (India))
Gapless spin liquid behaviour in the S = 1 honeycomb ruthenate Ag3LiRu2O6