Nonlinear Superconducting Magnetoelectric Effect

• URL: http://arxiv.org/abs/2404.18616v4
• Date: Tue, 14 May 2024 02:53:12 GMT
• Title: Nonlinear Superconducting Magnetoelectric Effect
• Authors: Jin-Xin Hu, Oles Matsyshyn, Justin C. W. Song,
• Abstract summary: A supercurrent flow can induce a nonvanishing spin magnetization in noncentrosymmetric superconductors with spin-orbit interaction. Here, we argue that a nonlinear superconducting magnetoelectric effect can naturally manifest in altermagnet/superconductor (ALM/SC) heterostructures. Strikingly, we find NSM is the leading order magnetization response in ALM/SC heterostructures and survives even in the presence of centrosymmetry.
• Score: 0.30723404270319693
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A supercurrent flow can induce a nonvanishing spin magnetization in noncentrosymmetric superconductors with spin-orbit interaction. Often known as the non-dissipative magnetoelectric effect, these are most commonly found at linear order in supercurrent flow. Here, we argue that a nonlinear superconducting magnetoelectric effect (NSM) can naturally manifest in altermagnet/superconductor (ALM/SC) heterostructures: NSM manifests as a spin polarization generated as a second-order response to a driving supercurrent. Strikingly, we find NSM is the leading order magnetization response in ALM/SC heterostructures and survives even in the presence of centrosymmetry; $C_4 \mathcal{T}$ symmetry in altermagnets zeroes both the equilibrium magnetization as well as out-of-plane linear magnetoelectric response. This renders NSM a powerful electric and non-dissipative means of controlling magnetization in ALM/SC heterostructures, a promising platform for superconducting spintronics.

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