Induced superconductivity in the three-dimensional topological insulator HgTe

Abstract

A strained and undoped HgTe layer is a three-dimensional topological insulator, in which electronic transport occurs dominantly through its surface states. In this Letter, we present transport measurements on HgTe-based Josephson junctions with Nb as superconductor. Although the Nb-HgTe interfaces have a low transparency, we observe a strong zero-bias anomaly in the differential resistance measurements. This anomaly originates from proximity-induced superconductivity in the HgTe surface states. In the most transparent junction, we observe periodic oscillations of the differential resistance as function of an applied magnetic field, which correspond to a Fraunhofer-like pattern. This unambiguously shows that a precursor of the Josephson effect occurs in the topological surface states of HgTe.

Accepted for publication in Physical Review Letters

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• Nonlocal thermoelectric engines in hybrid topological Josephson junctions
• Appearance of the universal value $e^2/h$ of the zero-bias conductance in a Weyl semimetal-superconductor junction
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• Crystalline Anisotropic Topological Superconductivity in Planar Josephson Junctions
• Transport Properties of Topological Insulators Films and Nanowires
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• Microwave studies of the fractional Josephson effect in HgTe-based Josephson junctions
• $Z_2$ index for gapless fermionic modes in the vortex core of three dimensional paired Dirac fermions
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• Structure of surface electronic states in strained mercury telluride
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• Long-range crossed Andreev reflection in topological insulator nanowires proximitized by a superconductor
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• Superconductivity in Weyl semimetals in a strong pseudomagnetic field
• Optical conductivity of the Majorana mode at the s- and d-wave topological superconductor edge