AI Article Synopsis
- The study investigates how certain potentials that disrupt time-reversal symmetry can help confine surface states in 3D topological insulators into quantum wires and dots.
- It introduces the concept of using magnetic domain walls on ferromagnetic insulator layers to create interfacial states that could demonstrate the quantum anomalous Hall effect (QAHE).
- The findings suggest that there's potential for isolating these confined states, making quantized QAHE states in quantum dots viable options for future quantum computing qubits.
Article Abstract
We explore potentials that break time-reversal symmetry to confine the surface states of 3D topological insulators into quantum wires and quantum dots. A magnetic domain wall on a ferromagnet insulator cap layer provides interfacial states predicted to show the quantum anomalous Hall effect (QAHE). Here, we show that confinement can also occur at magnetic domain heterostructures, with states extended in the inner domain, as well as interfacial QAHE states at the surrounding domain walls. The proposed geometry allows the isolation of the wire and dot from spurious circumventing surface states. For the quantum dots, we find that highly spin-polarized quantized QAHE states at the dot edge constitute a promising candidate for quantum computing qubits.
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| http://dx.doi.org/10.1103/PhysRevLett.111.106802 | DOI Listing |
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