Bound-states and polarized charged zero modes in three-dimensional topological insulators induced by a magnetic vortex

Abstract

By coating a three-dimensional topological insulator (TI) with a ferromagnetic film supporting an in-plane magnetic vortex, one breaks the time-reversal symmetry (TRS) without generating a mass gap. It rather yields electronic states bound to the vortex center which have different probabilities associated with each spin mode. In addition, its associate current (around the vortex center) is partially polarized with an energy gap separating the most excited bound state from the scattered ones. Charged zero-modes also appear as fully polarized modes localized near the vortex center. From the magnetic point of view, the observation of such a special current in a TI-magnet sandwich comes about as an alternative technique for detecting magnetic vortices in magnetic thin films.

8 pages, 3 figures, new version with more discussions and results accepted for publication in The European Physical Journal B

References in corpus (14)

• The electronic properties of graphene
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
• Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
• Hedgehog Spin-texture and Berry's Phase tuning in a Magnetic Topological Insulator
• Ordering of magnetic impurities and tunable electronic properties of topological insulators
• Z2 invariant protected bound states in topological insulators
• Spin-texture and magnetic anisotropy of Co adsorbed Bi${}_2$Se${}_3$ topological insulator surfaces
• Ground-state configurations in ferromagnetic nanotori
• An Index Theorem for Graphene
• Geometrically induced electric polarization in conical topological insulators
• Gauge fields at the surface of topological insulators

Cited by in corpus (3)

• Bound states of massive fermions in the Aharonov--Bohm-like fields
• Dominant Majorana bound energy and critical current enhancement in ferromagnetic-superconducting topological insulator
• Berry phases and zero-modes in toroidal topological insulator