Phys.org September 26, 2022
When external or intrinsic parameters break symmetries, global properties of topological materials change drastically. While a rich variety of non-trivial quantum phases could in principle also originate from broken time-reversal symmetry, realizing systems that combine magnetism with complex topological properties is remarkably elusive. An international team of researchers (Germany, USA – UC Davis) demonstrated that giant open Fermi arcs are created at the surface of ultrathin hybrid magnets where the Fermi-surface topology is substantially modified by hybridization with a heavy-metal substrate. The interplay between magnetism and topology allows for control of shape and the location of the Fermi arcs by tuning the magnetization direction. The hybridization points in the Fermi surface can be attributed to a non-trivial mixed topology and induce hot-spots in the Berry curvature, dominating spin and charge transport as well as magneto-electric coupling effects…read more. Open Access TECHNICAL ARTICLEÂ
Fermi arcs in a 2D topological ferromagnet. Credit: Nature Communications volume 13, Article number: 5309 (2022)Â