Impurity scattering on the surface of topological insulator thin films

Abstract

We address the electronic structure of the surface states of topological insulator thin films with embedded local non-magnetic and magnetic impurities. Using the $T$-matrix expansion of the real space Green's function, we derive the local density of electrons states and corresponding spin resolved densities. We show that the effects of the impurities can be tuned by applying an electric field between the surface layers. The emerging magnetic states are expected to play an important role both in ferromagnetic mechanism of magnetic topological insulators as well as in its transport properties. In the case of magnetic impurities, we have categorized the possible cases for different spin-directions of the impurities as well as the spin-direction in which the spin resolved density of electron states is calculated and related this to the spin susceptibility of the system.

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Cited by in corpus (14)

• Spontaneous supercurrent and $\varphi$0 phase shift parallel to magnetized topological insulator interfaces
• Strongly anisotropic RKKY interaction in monolayer black phosphorus
• Exact edge, bulk and bound states of finite topological systems
• Non-Linear Spin Susceptibility in Topological Insulators
• Exchange interaction of magnetic impurities in biased bilayer phosphorene nanoribbon
• Strain-induced modulation of exchange interaction in monolayer zigzag nanoribbons of B${}_2$S
• Electronic properties of the Dirac and Weyl systems with first- and higher-order dispersion in non-Fermi-liquid picture
• Tilt-induced anomalous thermal transport in normal/superconducting borophane junctions
• Tuning the electronic structure and magnetic coupling in armchair B${}_2$S nanoribbons using strain and staggered sublattice potential
• Effect of chiral selective tunneling on quantum transport in magnetic topological-insulator thin films
• Bound states and controllable currents on Topological Insulator surfaces with extended magnetic defects
• Electronic properties of the parabolic Dirac system
• Highly tunable magnetic coupling in ultrathin topological insulator films due to impurity resonances
• Charge qubits based on ultra-thin topological insulator films