Nonlinear Magnetoelectric Edelstein Effect

TL;DR

This paper introduces the nonlinear magnetoelectric Edelstein effect, a new mechanism for spin magnetization in materials with broken inversion symmetry, enabling detection of antiferromagnetic order and expanding nonlinear spin physics understanding.

Contribution

It proposes a novel nonlinear magnetoelectric Edelstein effect that occurs in time-reversal invariant, non-centrosymmetric materials, with potential applications in antiferromagnetic order detection.

Findings

Intrinsic component can appear in $ ext{T}$-invariant, non-centrosymmetric insulators.

Extrinsic component sensitive to Nél vector reversal in $ ext{PT}$-symmetric antiferromagnets.

Both effects produce sizable spin magnetization in model calculations.

Abstract

The linear Edelstein effect is a cornerstone phenomenon in spintronics that describes the generation of spin magnetization in response to an applied electric field. Recent theoretical advances have reignited interest in its nonlinear counterpart, the nonlinear Edelstein effect, in which spin magnetization is induced by a second-order electric field. However, the intrinsic contribution to both effects is generally forbidden in systems preserving time-reversal symmetry ($\mathcal{T}$) or composite symmetries such as $\mathcal{T}\tau_{1/2}$, where $\tau_{1/2}$ denotes a half-lattice translation. In such systems, spin magnetization typically emerges either from extrinsic mechanisms but limited to metals due to their Fermi-surface property, or from dynamical electric fields with a terahertz driving frequency. Here, we propose a new mechanism for spin magnetization, arising from the interplay of magnetic and electric fields, termed the nonlinear magnetoelectric Edelstein effect. Remarkably, its intrinsic component, determined purely by the material's band structure, can appear even in $\mathcal{T}$-invariant materials, but lacking inversion symmetry ($\mathcal{P}$), including insulators. On the other hand, we illustrate that its extrinsic component can serve as a sensitive indicator of the N\'eel vector reversal in $\mathcal{P}\mathcal{T}$-symmetric antiferromagnetic materials, offering a novel route for antiferromagnetic order detection. To validate our theory, we perform explicit calculations using a two-band Dirac model and a tight-binding model on a honeycomb lattice, finding that both effects yield sizable spin magnetization. Our findings establish the nonlinear magnetoelectric Edelstein effect as a versatile platform for both exploring nonlinear spin physics and enabling symmetry-based detection of antiferromagnetic order.