Topological magnetic textures in magnetic topological insulators

Abstract

The surfaces of intrinsic magnetic topological insulators (TIs) host magnetic moments exchange-coupled to Dirac electrons. We study the magnetic phases arising from tuning the electron density using variational and exact diagonalization approaches. In the dilute limit, we find that magnetic skrymions are formed which bind to electrons leading to a skyrmion Wigner crystal phase while at higher densities spin spirals accompanied by chiral 1d channels of electrons are formed. The binding of electrons to textures raises the possibility of manipulating textures with electrostatic gating. We determine the phase diagram capturing the competition of intrinsic spin-spin interactions and carrier density and comment on the possible application to experiments in magnetic TIs and spintronic devices such as skyrmion-based memory.

arXiv commentv2: highlighted the 4-parameter parameterization of skyrmions and elaborated on skyrmion Wigner crystal phase v1: 6+3 pages, 5 figures

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• Designer Meron Lattice on the Surface of a Topological Insulator
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• Magnetic warping in topological insulators
• Resonant optical topological Hall conductivity from skyrmions
• Interface-Induced Stability of Nontrivial Topological Spin Textures: Unveiling Room-Temperature Hopfions and Skyrmions
• Giant resonant skew scattering of plasma waves in a two-dimensional electron gas
• Giant Spin Transport Anisotropy in Magnetic Topological Insulators
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces