Interface metallic states between a topological insulator and a ferromagnetic insulator

Habe, Tetsuro; Asano, Yasuhiro

doi:10.1103/physrevb.85.195325

Cited by 17 publications

(17 citation statements)

References 31 publications

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“…The same can be also referred to an attempt to go beyond the scope of the 2D model. 16 In the present paper, within the framework of the continual approach, we study the physics of magnetic proximity effect at the TI/FMI heterocontact. This model generalizes an approach recently proposed to describe the electron states formed by the interface between TI and normal insulator (NI).…”

Section: Introductionmentioning

confidence: 99%

Magnetic proximity effect in the three-dimensional topological insulator/ferromagnetic insulator heterostructure

et al. 2013

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We theoretically study the magnetic proximity effect in the three-dimensional (3D) topological insulator/ ferromagnetic insulator (TI/FMI) structures in the context of possibility to manage the Dirac helical state in TI. Within a continual approach based on the k · p Hamiltonian, we predict that, when a 3D TI is brought into contact with a 3D FMI, the ordinary bound state arising at the TI/FMI interface becomes spin polarized due to the orbital mixing at the boundary. Whereas the wave function of FMI decays into the TI bulk on the atomic scale, the induced exchange field, which is proportional to the FMI magnetization, builds up at the scale of the penetration depth of the ordinary interface state. Such an exchange field opens the gap at the Dirac point in the energy spectrum of the topological bound state existing on the TI side of the interface. We estimate the dependence of the gap size on the material parameters of the TI/FMI contact.

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Section: Introductionmentioning

confidence: 99%

Magnetic proximity effect in the three-dimensional topological insulator/ferromagnetic insulator heterostructure

et al. 2013

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“…At the surface of the TI, because of the large spin-orbit coupling, the interaction between the Dirac-like surface states and the impurities induces a large single ion magnetic anisotropy and polarizes the spin of the impurities perpendicularly to the surface. This spin-orbit coupling translates in the opening of an energy gap at the Dirac point of the surface states [10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Temperature-induced spin density wave in a magnetically doped topological insulator Bi2Se3

Lasia

Brey²

2012

Phys. Rev. B

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We study the magnetic properties of Bi2Se3 doped with isoelectronic magnetic impurities. We obtain that at zero temperature the impurities order ferromagnetically, but when raising the temperature the system undergoes a first order phase transition to a spin density wave phase before the system reaches the paramagnetic phase. The origin of this phase is the non-trivial dependence of the spin susceptibility on the momentum. We analyze the coupling of the non-uniform magnetic phase with the Dirac electronic system that occurs at the surfaces of the topological insulator.

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“…[14][15][16][17] It has been already known that the surface state of a single TI is sensitive to the direction of Zeeman field. [18][19][20][21] We also find that the interface states at the zero energy are also sensitive to the direction of Zeeman field. We conclude that such magnetic anisotropy stems from the mirror symmetry.…”

Section: Introductionmentioning

confidence: 71%

Robustness of gapless interface states in a junction of two topological insulators

Habe

Asano

2013

Phys. Rev. B

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We theoretically study subgap states appearing at the interface between two three-dimensional topological insulators which have different configurations in the spin-orbit interactions from each other. The coupling of spin σ with momenta p is configured by a material dependent 3 × 3 matrix as σ μ ν μ p ν . The spectra of the interface subgap states depend on the relative choices of 's in the two topological insulators where the two are connected by the unitary transformation including the inversion and the rotation in momentum space. The gapless states appear at the interface when the transformation includes the inversion. The two topological insulators can be distinguished by using the topological numbers defined in the two-or one-dimensional partial Brillouin zone, which explains the presence of the gapless interface states. We also discuss the robustness of such gapless states under perturbations breaking the time-reversal symmetry or the band-inversion symmetry.

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Interface metallic states between a topological insulator and a ferromagnetic insulator

Cited by 17 publications

References 31 publications

Magnetic proximity effect in the three-dimensional topological insulator/ferromagnetic insulator heterostructure

Magnetic proximity effect in the three-dimensional topological insulator/ferromagnetic insulator heterostructure

Temperature-induced spin density wave in a magnetically doped topological insulator Bi2Se3

Robustness of gapless interface states in a junction of two topological insulators

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