Quantum Corrals and Quantum Mirages on the Surface of a Topological Insulator

Abstract

We study quantum corrals on the surface of a topological insulator (TI). Different resonance states induced by nonmagnetic (NM), antiferromagnetic (AFM), and ferromagnetic (FM) corrals are found. Intriguingly, the spin is clearly energy-resolved in a FM corral, which can be effectively used to operate surface carrier spins of TI. We also show that an observable quantum mirage of a magnetic impurity can be projected from the occupied into the empty focus of a FM elliptic corral, while in NM and AFM corrals the mirage signal becomes negligibly weak. In addition, the modulation of the interaction between two magnetic impurities in the quantum corrals is demonstrated. These prominent effects may be measured by spin-polarized STM experiments.

5 PRB pages, 4 figures

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Cited by in corpus (5)

• Disorder enabled band structure engineering of a topological insulator surface
• Connection topology of step edge state bands at the surface of a three dimensional topological insulator
• Quantum correlations in nanostructured two-impurity Kondo systems
• Anisotropic Fabry-Pérot resonant states confined within nano-steps on the topological insulator surface
• Theory of multiple magnetic scattering for quasiparticles on a gapless topological insulator surface