Interface Metallic States between a Topological Insulator and a Ferromagnetic Insulator

Abstract

We study electronic structures at an interface between a topological insulator and a ferromagnetic insulator by using three-dimensional two-band model. In usual ferromagnetic insulators, the exchange potential is much larger than the bulk gap size in the topological insulators and electronic structures are asymmetric with respect to the fermi level. In such situation, we show that unusual metallic states appear under the magnetic moment pointing the perpendicular direction to the junction plane, which cannot be described by the two-dimensional effective model around the Dirac point. When the magnetic moment is in the parallel direction to the plane, the number of Dirac cones becomes even integers. The conclusions obtained in analytical calculations are confirmed by numerical simulations on tight-binding lattice.

9 pages, 5 figures

References in corpus (22)

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• Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface
• Proximity effect at the superconductor - topological insulator interface
• Spin and Charge Transport on the Surface of a Topological Insulator
• Dynamics of magnetization on the topological surface
• Electric charging of magnetic textures on the surface of a topological insulator
• First-principles study of phase stability of Gd-doped EuO and EuS
• Microscopic simulation of superconductor-topological insulator proximity structures
• Thermoelectric transport of perfectly conducting channels in two- and three-dimensional topological insulators

Cited by in corpus (8)

• Magnetic proximity effect in the 3D topological insulator/ferromagnetic insulator heterostructure
• Temperature Induced Spin Density Wave in Magnetic Doped Topological Insulators
• Robustness of Gapless Interface State in a Junction of Two Topological Insulators
• Tunneling Conductance in a Two-dimensional Dirac Semimetal Protected by Non-symmorphic Symmetry
• Three-dimensional symmetry breaking topological matters
• Inter-surface interaction via phonon in three-dimensional topological insulator
• Gapped energy spectra around the Dirac node at the surface of a 3D topological insulator in the presence of the time-reversal symmetry
• Weak localization effect in topological insulator micro flakes grown on insulating ferrimagnet BaFe12O19