Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Topology: Quantum Hall Systems
TT 31.3: Vortrag
Mittwoch, 19. März 2025, 15:45–16:00, H31
Topological Thermal Hall Effect in the Geometrically Frustrated Magnet Gd2PdSi3 — •Parisa Mokhtari1,2, Daiki Yamaguchi1, Rinsuke Yamada1, Akiko Kikkawa3, Philipp Gegenwart2, Yasujiro Taguchi3, Yoshinori Tokura1,3, and Max Hirschberger1,3 — 1Department of Applied Physics and Quantum-Phase Electronics Center, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan — 2Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany — 3RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
Geometrical frustrated Skyrmion lattices exemplify nontrivial topological states with non-zero scalar spin chirality and a finite Berry curvature in real space. In 2019, T. Kurumaji et al. reported a large topological Hall effect in the skyrmion phase in Gd2PdSi3 related to the spin chirality of the ground state [1].
In this talk, I will present the thermal Hall conductivity of the frustrated triangular-lattice magnet Gd2PdSi3. By entering the skyrmion lattice ground state, the field-dependent thermal Hall effect sharply increases against the adjacent incommensurate phases, similar to the electric Hall conductivity behaviour. Eventually, I will investigate the relationship of Hall entropy to the charge current and discuss the non-dissipativity of topological quantum transport in the geometrically frustrated magnet Gd2PdSi3.
[1] T. Kurumaji et al., Science 365, 914 (2019).