Magnetically Defined Qubits on 3D Topological Insulators

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.

5 pages, 4 figures

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• Topological Field Theory of Time-Reversal Invariant Insulators
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• Magnetize Topological Surface States of Bi2Se3 with a CrI3 Monolayer
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• Confinement and Fermion Doubling Problem in Dirac-like Hamiltonians
• Absence of equilibrium edge currents in theoretical models of topological insulators
• Local optical control of ferromagnetism and chemical potential in a topological insulator
• Orbital pseudospin-momentum locking in two-dimensional chiral borophene
• Charge-Induced Spin Torque in Anomalous Hall Ferromagnets
• Electric coupling in scanning SQUID measurements
• Observation of chiral currents at the magnetic domain boundary of a topological insulator
• Tunable skyrmion-skyrmion binding on the surface of a topological insulator
• Interplay between boundary conditions and Wilson's mass in Dirac-like Hamiltonians
• Highly Tunable Spin-Orbit Torque and Anisotropic Magnetoresistance in a Topological Insulator Thin Film Attached to Ferromagnetic Layer
• Zitterbewegung and bulk-edge Landau-Zener tunneling in topological insulators
• Blurring the boundaries between topological and non-topological phenomena in dots
• Gate-defined coupled quantum dots in topological insulators
• Low-energy electronic properties of Weyl semimetal quantum dot
• Fabry-Pérot resonant vortices and magnetoconductance in topological insulator constrictions with magnetic barriers
• Mass-profile quantum dots in graphene
• Topological insulators in random potentials
• Scars in Dirac fermion systems: the influence of an Aharonov--Bohm flux
• Berry-phase switch in electrostatically-confined topological surface states
• Robustness of persistent currents in two-dimensional Dirac systems with disorders
• Partial Charge Transfer and Absence of Induced Magnetization in EuS(111)/Bi${}_2$Se${}_3$ Heterostructures
• Dirac electrons in the presence of matrix potential barrier: application to graphene and topological insulators
• Topological magnetic dipolar interaction and non-local electric magnetization control in topological insulator heterostructures
• A complementary screening for quantum spin Hall insulators in 2D exfoliable materials
• Design of spin-orbital-textures in ferromagnetic/topological insulator interfaces
• Correlation and current anomalies in helical quantum dots
• Formation of bound states from the edge states of 2D topological insulator by macroscopic magnetic barriers
• Control of intervalley scattering in Bi${}_2$Te${}_3$ via temperature-dependent band renormalization
• Charge qubits based on ultra-thin topological insulator films
• Electronic confinement of surface states in a topological insulator nanowire
• Bulk transport properties of Bismuth selenide thin films approaching the two-dimensional limit