Paradoxical Topological Soliton Lattice in Anisotropic Frustrated Chiral Magnets

2D chiral magnets are known to host a variety of skyrmions, characterized by an integer topological charge ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mi>Q</mml:mi> <mml:mo>∈</mml:mo> <mml:mi>Z</mml:mi></mml:mrow> <mml:annotation>$Q \in \mathbb {Z}$</mml:annotation></mml:semantics> </mml:math> ). However, these systems typically favor uniform lattices as thermodynamically stable phases composed of either skyrmions (Q = -1) or antiskyrmions (Q = 1). In isotropic chiral magnets, skyrmion-antiskyrmion coexistence is typically transient due to mutual annihilation, making the observation of a stable, long-range, ordered lattice a significant challenge. Here, this challenge is addressed by demonstrating a skyrmion-antiskyrmion lattice as a magnetic field-induced topological ground state in chiral magnets with competing anisotropic interactions, specifically Dzyaloshinskii-Moriya and frustrated exchange interactions. This unique lattice exhibits a net-zero global topological charge due to the balanced populations of skyrmions and antiskyrmions. Furthermore, density functional theory and spin-lattice simulations identify 2Fe/InSb(110) as an ideal candidate material for realizing this phase. This finding reveals new possibilities for manipulating magnetic solitons and establishes anisotropic frustrated chiral magnets as a promising material class for future spintronic applications.