Scanning tunneling microscopy of superconducting topological surface states in Bi sub(2) Se super(3)

In this Rapid Communication we present scanning tunneling microscopy of a large Bi sub(2) Se sub(3) crystal with superconducting PbBi islands deposited on the surface. Local density of states measurements are consistent with induced superconductivity in the topological surface state with a coherence...

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Bibliographic Details
Published in:Physical review. B 2016-06, Vol.93 (22)
Main Authors: Dayton, Ian M, Sedlmayr, Nicholas, Ramirez, Victor, Chasapis, Thomas C, Loloee, Reza, Kanatzidis, Mercouri G, Levchenko, Alex, Tessmer, Stuart H
Format: Article
Language:English
Subjects:
Condensed matter
Density of states
Islands
Oscillations
Scanning tunneling microscopy
Spectra
Superconductivity
Topology
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Summary:In this Rapid Communication we present scanning tunneling microscopy of a large Bi sub(2) Se sub(3) crystal with superconducting PbBi islands deposited on the surface. Local density of states measurements are consistent with induced superconductivity in the topological surface state with a coherence length of order 540 nm. At energies above the gap the density of states exhibits oscillations due to scattering caused by a nonuniform order parameter. Strikingly, the spectra taken on islands also display similar oscillations along with traces of the Dirac cone, suggesting an inverse topological proximity effect.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.220506