Designer Meron Lattice on the Surface of a Topological Insulator

Abstract

We present a promising route to realize spontaneous magnetic order on the surface of a 3D topological insulator by applying a superlattice potential. The superlattice potential creates tunable van Hove singularities, which, when combined with strong spin-orbit coupling and Coulomb repulsion give rise to a topological meron lattice spin texture. The periodicity of this designer meron lattice can be tuned by varying the periodicity of the superlattice potential. We characterize the magnetic order using Ginzburg-Landau theory and show that the magnetic transition temperature reaches experimentally accessible values. Our work introduces a new direction to realize exotic quantum order by engineering interacting Dirac electrons in a superlattice potential, with promising applications to spintronics.

11 pages, 5 figures and 2 tables

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Cited by in corpus (15)

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• Multilayer graphene with a superlattice potential
• Symmetries as the guiding principle for flattening bands of Dirac fermions
• Higher vortexability: zero field realization of higher Landau levels
• Magic angle conditions for twisted 3D topological insulators
• Chiral model of twisted bilayer graphene realized in a monolayer
• Non-coplanar magnetism, topological density wave order and emergent symmetry at half-integer filling of moiré Chern bands
• ${\mathbb{Z}}_2$-Nontrivial Moiré Minibands and Interaction-Driven Quantum Anomalous Hall Insulators in Topological Insulator Based Moiré Heterostructures
• Intrinsically-multilayer moiré heterostructures
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• Topological hybrid electron-hole Cooper pairing
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