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TT: Fachverband Tiefe Temperaturen

TT 93: Superconductivity – Poster II

TT 93.19: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Superconductivity in Mott Altermagnets — •Robin Schleicher and Maria Daghofer — Institute for Functional Matter and Quantum Technologies, University of Stuttgart

Earlier studies on the Hubbard model have shown that the ground state of two holes in a small cluster lattice shows d-wave symmetry. While pairing by holes doped into half-filled Hubbard models has been intensively investigated, we extend such an analysis to the case of doped strong-coupling altermagnets. In this new approach, we investigate differences to strong-coupling antiferromagnets as well as to weak-coupling superconductivity in altermagnets. To do so, we use exact diagonalization techniques for a checkerboard model. In our case, nodes in d-wave altermagnetism do not coincide with gap nodes expected from the Hubbard model. We discuss the extend of d-wave superconductivity and its competition with other pairing symmetries. We find altermagnetism to suppress pairing compared to antiferromangetism. We also discuss applications to inverted Lieb lattices relevant to Mott-altermagnet materials.

Keywords: altermagnetism; superconductivity; pairing-symmetry; d-wave; checkerboard model