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TT: Fachverband Tiefe Temperaturen

TT 18: Skyrmions (joint session TT/MA)

TT 18.3: Vortrag

Montag, 16. März 2020, 16:45–17:00, HSZ 304

Vortex-Phase in Non-Centrosymetric Antiferromagnets — •Benjamin Wolba¹, Sebastian Mühlbauer², and Markus Garst¹ — ¹Institut für Theoretische Festkörperphysik (TFP), Karlsruhe Institut für Technologie (KIT), 76131 Karlsruhe — ²Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany

In this work we consider two-dimensional, non-centrosymmetric antiferromagnets, for which the competition between exchange and Dyzaloshinskii-Moriya interaction leads to the formation of spatially modulated phases of the staggered order parameter. Within the framework of Ginzburg-Landau theory we show that by applying a magnetic field parallel to the c-axis, which thus induces easy-plane anisotropy, one can stabilize a square lattice of vortices close to Neel temperature. Upon decreasing temperature, this vortex phase undergoes spontaneous symmetry breaking into a rectangular phase, which was not anticipated before. We discuss the relevance of our results for the chiral antiferromagnet Ba₂CuGe₂O₇.