Speaker
Description
Unconventional superconductivity is traditionally understood from a single-band perspective. However, many newly discovered superconductors do not naturally fit within this paradigm. Unconventional magnets, such as altermagnets and odd-parity magnets, have recently emerged as important classes of magnetic materials for spintronics due to their vanishing net magnetization and large, strongly momentum dependent, energy splittings between opposite spin electronic states. Here I present recent progress on sublattice-based Hubbard Hamiltonians for both unconventional magnetism and superconductivity. These Hubbard models provide insight into the origins of non-relativistic spin splittings in unconventional magents [1,2,3] and odd-parity superconducting states [4].
[1] Minimal models for altermagnetism, M. Roig, A. Kreisel, Y. Yu, B. M. Andersen, and D. F. Agterberg, Phys. Rev. B 110, 144412 (2024).
[2] Odd-parity magnetism driven by antiferromagnetic exchange, Y. Yu, M.B. Lyngby, T. Shishidou, M. Roig, A. Kreisel, M. Weinert, B. M. Andersen, D. F. Agterberg, Phys. Rev. Lett. 135, 046701 (2025).
[3] Altermagnetism from coincident Van Hove singularities: application to κ-Cl, Y. Yu, H.G. Suh, M. Roig, and D.F. Agterberg, Nature Communications 16, 2950 (2025).
[4] Unified picture of superconductivity and magnetism in CeRh2As2, C. Lee, D.F. Agterberg, and P.M.R. Brydon, Phys. Rev. Lett. 135, 026003 (2025).