Work

Interplay between altermagnetism and superconductivity in two dimensions: intertwined symmetries and singlet-triplet mixing

Year: 2025

Type: article

Abstract: We study the interplay between altermagnetism and unconventional superconductivity for two-dimensional square- and triangular-lattice systems. Our approach is based on an effective single particle Hamiltonian which mimics the alternating spin splitting of the d - w a v e and i - w a v e altermagnetic state. By supplementing the model with intersite pairing term we characterize the principal features of the coexistent altermagnetic-superconducting state as well as the possibility of inducing the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. Our calculations show that the subtle interplay between the symmetries of the superconducting and altermagnetic order parameters as well as the shape/size of the Fermi surface lead to various types of anisotropic behaviors of the resultant non-zero momentum pairing, which has not been possible in the originally proposed FFLO state. Moreover, additional pairing symmetries appear leading to multi-component order parameter with singlet-triplet mixing. We discuss our result in the context of possible applications like, e.g., the superconducting diode.

Source: npj Quantum Materials

DOI: 10.1038/s41535-025-00840-w

Authors: Kinga Jasiewicz, Paweł Wójcik, Michał P. Nowak, Michał Zegrodnik

Institution: AGH University of Krakow

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,890

Funders: Infrastruktura PL-Grid, Academic Computer Centre Cyfronet, AGH University of Science and Technology