Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 21: Quantum Materials
MON 21.2: Talk
Monday, September 8, 2025, 16:45–17:00, ZHG103
Emergent quantum phenomena in a two-dimensional magnet — •Ying-Jiun Chen1, Tzu-Hung Chuang2, Jan-Philipp Hanke1, Markus Hoffmann1, Gustav Bihlmayer1, Yuriy Mokrousov1,3, Stefan Blügel1, Claus Michael Schneider1,4, and Christian Tusche1,4 — 1Forschungszentrum Jülich — 2National Synchrotron Radiation Research Center, Taiwan — 3Johannes Gutenberg University Mainz — 4University of Duisburg-Essen
Quantum phenomena that result from the breaking of time-reversal symmetry offer an innovative platform for nonvolatile switching of physical properties by controlling the direction of the sample magnetization. Magnetic order serves as an ideal means to create on-demand topological phase transitions and significantly alter the topology of the electronic states. In this talk, we present emergent quantum phenomena and magnetic control in a two-dimensional magnet by momentum microscopy. We show that giant open Fermi arcs are created at the surface of an ultrathin hybrid magnet, composed of two iron monolayers, where the Fermi-surface topology is substantially modified by hybridization with the heavy-metal substrate tungsten [1]. The interplay between magnetism and topology allows us to control the shape and the location of the Fermi arcs by tuning the magnetization direction, which dominates spin and charge transport as well as magneto-electric coupling effects [2]. Our findings not only provide a knob to tune the physical properties in a solid, but also offer a platform for prospective quantum devices. [1] Y.-J. Chen et al., Nat. Commun. 13, 5309 (2022). [2] Y.-J. Chen et al., Appl. Phys. Lett. 124, 093105 (2024).
Keywords: Topological materials; Magnetism; Spin waves; Spintronics; Momentum microscopy