Robust and fragile Majorana bound states in proximitized topological insulator nanoribbons

Abstract

Topological insulator (TI) nanoribbons with proximity-induced superconductivity are a promising platform for Majorana bound states (MBSs). In this work, we consider a detailed modeling approach for a TI nanoribbon in contact with a superconductor via its top surface, which induces a superconducting gap in its surface-state spectrum. The system displays a rich phase diagram with different numbers of end-localized MBSs as a function of chemical potential and magnetic flux piercing the cross section of the ribbon. These MBSs can be robust or fragile upon consideration of electrostatic disorder. We simulate a tunneling spectroscopy setup to probe the different topological phases of top-proximitized TI nanoribbons. Our simulation results indicate that a top-proximitized TI nanoribbon is ideally suited for realizing fully gapped topological superconductivity, in particular when the Fermi level is pinned near the Dirac point. In this regime, the setup yields a single pair of MBSs, well separated at opposite ends of the proximitized ribbon, which gives rise to a robust quantized zero-bias conductance peak.

arXiv comment12 pages, 5 figures

References in corpus (43)

• Topological Insulators
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Unpaired Majorana fermions in quantum wires
• Non-Abelian statistics and topological quantum information processing in 1D wire networks
• Kwant: a software package for quantum transport
• Model Hamiltonian for Topological Insulators
• Majorana Fermions in Semiconductor Nanowires
• Flux-controlled quantum computation with Majorana fermions
• Coulomb-assisted braiding of Majorana fermions in a Josephson junction array
• Topological Superconductor Bi2Te3/NbSe2 heterostructures
• Majorana Fermions in Proximity-coupled Topological Insulator Nanowires
• Physical mechanisms for zero-bias conductance peaks in Majorana nanowires
• Aharonov-Bohm oscillations in disordered topological insulator nanowires
• Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials
• Anomalous Aharonov-Bohm conductance oscillations from topological insulator surface states
• Efficient numerical computation of the Pfaffian for dense and banded skew-symmetric matrices
• Interaction-induced criticality in Z_2 topological insulators
• Aharonov-Bohm Oscillations in a Quasi-Ballistic 3D Topological Insulator Nanowire
• Magnetic field induced helical mode and topological transitions in a quasi-ballistic topological insulator nanoribbon with circumferentially quantized surface state sub-bands
• Wormhole Effect in a Strong Topological Insulator
• Realization of a vertical topological p-n junction in epitaxial $\mathrm{S}{\mathrm{b}}_2\mathrm{T}{\mathrm{e}}_3/B{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_3$ heterostructures
• Stability of Majorana Fermions in Proximity-Coupled Topological Insulator Nanowires
• Orbital effect of magnetic field on the Majorana phase diagram
• Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire
• Probing Spin Helical Surface States in Topological HgTe Nanowires
• Magnetic-field instability of Majorana modes in multiband quantum wires
• Quantum confinement of the Dirac surface states in topological-insulator nanowires
• Robust Transport Signatures of Topological Superconductivity in Topological Insulator Nanowires
• Tuning the Dirac point to the Fermi level in the ternary topological insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$
• Pseudo-ballistic transport in 3D topological insulator quantum wires
• Majorana bound states in topological insulators without a vortex
• Proximity-induced superconductivity in (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ topological-insulator nanowires
• Transport spectroscopy of induced superconductivity in the three-dimensional topological insulator HgTe
• Induced spectral gap and pairing correlations from superconducting proximity effect
• Conditions for fully gapped topological superconductivity in topological insulator nanowires
• Severe Dirac Mass Gap Suppression in Sb_2Te_3-based Quantum Anomalous Hall Materials
• Magnetotransport signatures of three-dimensional topological insulator nanostructures
• Robustness of Topological Superconductivity in Proximity-Coupled Topological Insulator Nanoribbons
• Adjustable quantum interference oscillations in Sb-doped Bi2Se3 topological insulator nanoribbons
• Quantum electrical transport properties of topological insulator Bi2Te3 nanowires
• Metallization and proximity superconductivity in topological insulator nanowires
• Gate-induced decoupling of surface and bulk state properties in selectively-deposited Bi${}_2$Te${}_3$ nanoribbons
• Robust and fragile Majorana bound states in proximitized topological insulator nanoribbons

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• Low-energy modeling of three-dimensional topological insulator nanostructures
• Characterizing the chemical potential disorder in the topological insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ thin films
• Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels
• Optimizing proximitized magnetic topological insulator nanoribbons for Majorana bound states
• In-plane magnetic field driven conductance modulations in topological insulator kinks