Phys.org December 19, 2024
When the skyrmion lattice (SkL) acquires a drift velocity under conduction electron flow, an emergent electric field is also generated. The resulting emergent electrodynamics dictate the magnitude of the topological Hall effect (THE) by the relative motion of SkL and conduction electrons. Researchers in Japan reported the emergent electrodynamics induced by SkL motion in Gd2PdSi3, facilitated by its giant THE. They observed the dynamic transition of the SkL motion from the pinned to creep regime and finally to the flow regime, in which the THE was totally suppressed. According to the researchers the Galilean relativity required for the total cancellation of the THE may be generically recovered in the flow regime, even in complex multiband systems. THE voltages were large enough to enable real-time measurement of the SkL velocity–current profile, which showed the inertial-like motion of the SkL in the creep regime, appearing as the current hysteresis of the skyrmion velocity….read more. TECHNICAL ARTICLE  [An Author Correction to this article was published on 29 November 2024]
Nonlinear THE of the SkL in Gd2PdSi3. Credit: Nature volume 633, pages 554–559, 18 September 2024Â