Electric charging of magnetic textures on the surface of a topological insulator

Details Electric charging of magnetic textures on the surface of a topological insulator Electric charging of magnetic textures on the surface of a topological insulator

2010-06-22

arxiv.org/abs/1006.4217v3

Phys. Rev. B 82, 161401 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.82.161401

A three-dimensional topological insulator manifests gapless surface modes, described by two-dimensional Dirac equation. We study magnetic textures, such as domain walls and vortices, in a ferromagnetic thin film deposited on a three-dimensional topological insulator. It is shown that these textures can be electrically charged, ascribed to the proximity effect with the Dirac surface states. We derive a general relation between the electric and the magnetic charges. As a physical consequence, we discuss domain wall motion driven by an applied electric field, which promises magnetic devices with high thermal efficiency.

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