Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure

Abstract

Majorana fermions have been intensively studied in recent years for their importance to both fundamental science and potential applications in topological quantum computing1,2. Majorana fermions are predicted to exist in a vortex core of superconducting topological insulators3. However, they are extremely difficult to be distinguished experimentally from other quasiparticle states for the tiny energy difference between Majorana fermions and these states, which is beyond the energy resolution of most available techniques. Here, we overcome the problem by systematically investigating the spatial profile of the Majorana mode and the bound quasiparticle states within a vortex in Bi2Te3/NbSe2. While the zero bias peak in local conductance splits right off the vortex center in conventional superconductors, it splits off at a finite distance ~20nm away from the vortex center in Bi2Te3/NbSe2, primarily due to the Majorana fermion zero mode. While the Majorana mode is destroyed by reducing the distance between vortices, the zero bias peak splits as a conventional superconductor again. This work provides strong evidences of Majorana fermions and also suggests a possible route to manipulating them.

16 pages, 4 figures

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• Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device
• Experimental demonstration of the topological surface states protected by the time-reversal symmetry
• Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Zero-bias peaks in spin-orbit coupled superconducting wires with and without Majorana end-states
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• Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices
• Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire
• Topological Superconductor Bi2Te3/NbSe2 heterostructures
• Class D spectral peak in Majorana quantum wires
• Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials
• Proximity-induced high-temperature superconductivity in topological insulators Bi2Se3 and Bi2Te3
• Robustness of Majorana fermions in 2D topological superconductors
• Robustness of topologically protected surface states in layering of Bi2Te3 thin films
• Strong Superconducting Proximity Effect in Pb-Bi2Te3 Hybrid Structures
• Symmetry Protected Josephson Supercurrents in Three-Dimensional Topological Insulators
• Vortex Lines in Topological Insulator-Superconductor Heterostructures
• Effects of gap anisotropy upon the electronic structure around a superconducting vortex
• Tunneling spectrum of a pinned vortex with a robust Majorana state
• Testing for Majorana Zero Modes in a Px+iPy Superconductor at High Temperature by Tunneling Spectroscopy

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