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Designer Meron Lattice on the Surface of a Topological Insulator

Daniele GuerciJie WangJ. H. PixleyJennifer Cano
摘要
We present a promising new route to realize spontaneous magnetic order on thesurface of a 3D topological insulator by applying a superlattice potential. Thesuperlattice potential creates tunable van Hove singularities, which, whencombined with strong spin-orbit coupling and Coulomb repulsion give rise to atopological meron lattice spin texture. The periodicity of this designer meronlattice can be tuned by varying the periodicity of the superlattice potential.We characterize the magnetic order using Ginzburg-Landau theory and show thatthe magnetic transition temperature reaches experimentally accessible values.Our work introduces a new direction to realize exotic quantum order byengineering interacting Dirac electrons in a superlattice potential, withpromising applications to spintronics.
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