Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.60: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Phase diagram of chiral antiferromagnets — •Benjamin Wolba¹, Sebastian Mühlbauer², and Markus Garst¹ — ¹Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — ²Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany

Chiral antiferromagnets are characterized by a Dyzaloshinskii-Moriya interaction that stabilizes spatially modulated phases of the staggered order parameter. In the framework of a Ginzburg-Landau theory, we determine the phase diagram as a function of temperature and magnetic field. In zero magnetic field, a phase with spiral antiferromagnetic order is present. A finite field naturally leads to an easy-plane anisotropy that induces a spinflop transition into a topological phase consisting of a square-lattice of vortices and antivortices. We discuss the relevance of our results for the chiral antiferromagnet Ba₂CuGe₂O₇.