Home > Publications database > Robust and Fragile Majorana Bound States in Proximitized Topological Insulator Nanoribbons > print

001     999176
005     20231027114355.0
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100 1 _ |a Heffels, Dennis
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245 _ _ |a Robust and Fragile Majorana Bound States in Proximitized Topological Insulator Nanoribbons
260 _ _ |a Basel
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520 _ _ |a 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.
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700 1 _ |a Burke, Declan
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700 1 _ |a Connolly, Malcolm R.
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700 1 _ |a Schüffelgen, Peter
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700 1 _ |a Grützmacher, Detlev
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700 1 _ |a Moors, Kristof
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773 _ _ |a 10.3390/nano13040723
|g Vol. 13, no. 4, p. 723 -
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|t Nanomaterials
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|y 2023
|x 2079-4991
856 4 _ |u https://juser.fz-juelich.de/record/999176/files/nanomaterials-13-00723.pdf
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