LaBr2 bilayer multiferroic moiré superlattice with robust magnetoelectric coupling and magnetic bimerons

Abstract Two-dimensional (2D) van der Waals (vdW) materials provide the versatile playground to stack two or more vdW layers for creation of superior with desired properties. Here we theoretically adopt a twisted stack-engineering LaBr 2 monolayers break space inversion symmetry ferroelectricity and ultimately multiferroism. The enhancement reversal electric polarization are accompanied transition from interlayer ferromagnetic antiferromagnetic orderings, demonstrating an effective magnetoelectric coupling effect mechanism dissimilar that conventional multiferroics. Magnetization dynamics simulations show such magnetic phase can excite topologically protected bimeron, skyrmion Hall be suppressed by bilayer-bimeron stabilized in both configurations. Moreover, small-angle moiré superlattice, uniform will evolve into staggered domain structure, appearance which forms significant discrepancy non-twisted stack-engineered multiferroic bilayer. This work provides strategy 2D engineering single layers.