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TT: Fachverband Tiefe Temperaturen
TT 98: Altermagnets
TT 98.5: Vortrag
Freitag, 13. März 2026, 10:30–10:45, CHE/0091
Crossed surface flat bands in three-dimensional superconducting altermagnets — Yuri Fukaya1, Bo Lu2, Keiji Yada3, Yukio Tanaka3, and •Jorge Cayao4 — 1Faculty of Environmental Life, Natural Science and Technology, Okayama University, 700-8530 Okayama, Japan — 2Department of Physics, Tianjin University, 300354 Tianjin, China — 3Department of Applied Physics, Nagoya University, 464-8603 Nagoya, Japan — 4Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
Superconducting altermagnets have proven to be a promising ground for emergent phenomena but their study has involved two dimensional systems. Here, we investigate three-dimensional d- and g-wave altermagnets with chiral d-wave superconductivity and show the formation of crossed surface flat bands due to the underlying symmetries. We find that these crossed flat bands appear at zero energy in the surface along z due to the superconducting nodal lines in the xy-plane, while the number of corners is determined by the crystal symmetry of altermagnets. We also show that the superconducting nodal lines give rise to Bogoliubov-Fermi surfaces, which then affect the appearance of zero-energy arcs in the surface along x. Moreover, we demonstrate that the crossed surface flat bands, surface arcs, and Bogoliubov-Fermi surfaces give rise to distinct signals in charge conductance, hence offering a solid way for their detection and paving the way for realizing higher dimensional topological phases using altermagnets.
Keywords: altermagnet; flat band