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

IF 6.6 1区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Quantum Materials Pub Date : 2026-06-06 DOI:10.1038/s41535-026-00898-0

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

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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-wave and i-wave 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.

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二维中电磁场和超导的相互作用：交织的对称性和单重态-三重态混合

我们研究了二维方形晶格和三角形晶格体系的互磁和非常规超导之间的相互作用。我们的方法是基于一个有效的单粒子哈密顿量，它模拟了d波和i波交变磁态的交替自旋分裂。通过在模型中加入点间配对项，我们描述了交变超导共存态的主要特征以及诱导富尔德-费雷尔-拉金-奥夫钦尼科夫（FFLO）相的可能性。我们的计算表明，超导和交替磁序参数的对称性以及费米表面的形状/尺寸之间的微妙相互作用导致了所产生的非零动量对的各种类型的各向异性行为，这在最初提出的FFLO状态中是不可能的。此外，在单重态-三重态混合的情况下，会出现额外的配对对称性，从而导致多分量的序参量。我们在可能应用的背景下讨论我们的结果，例如超导二极管。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

10.60

自引率

3.50%

发文量

107

审稿时长

6 weeks

期刊介绍： npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.