Abstract
On the road of searching for Majorana zero modes (MZMs) in topological insulator-based Josephson junctions, a highly sought signature is the protected full transparency of electron transport through the junctions due to the existence of the MZMs, associated with complete gap closing between the electronlike and holelike Andreev bound states (ABSs). Here we present direct experimental evidence of gap closing and full transparency in single Josephson junctions constructed on the surface of three-dimensional topological insulator (3D TI) ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$. Our results demonstrate that the two-dimensional (2D) surface of 3D TIs provides a promising platform for hosting and manipulating MZMs.
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