Quantum 2025 – wissenschaftliches Programm

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MON: Monday Contributed Sessions

MON 21: Quantum Materials

MON 21.2: Vortrag

Montag, 8. September 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 Mokrousov^1,3, Stefan Blügel¹, Claus Michael Schneider^1,4, and Christian Tusche^1,4 — 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