Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe0.55Se0.45

Damianos Chatzopoulos, Doohee Cho, Koen M. Bastiaans, Gorm O. Steffensen, Damian Bouwmeester, Alireza Akbari, Genda Gu, Jens Paaske, Brian M. Andersen and Milan P. Allan ()
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Damianos Chatzopoulos: Leiden University
Doohee Cho: Leiden University
Koen M. Bastiaans: Leiden University
Gorm O. Steffensen: University of Copenhagen
Damian Bouwmeester: Leiden University
Alireza Akbari: Max Planck Institute for the Chemical Physics of Solids
Genda Gu: Brookhaven National Laboratory
Jens Paaske: University of Copenhagen
Brian M. Andersen: University of Copenhagen
Milan P. Allan: Leiden University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract By using scanning tunneling microscopy (STM) we find and characterize dispersive, energy-symmetric in-gap states in the iron-based superconductor FeTe0.55Se0.45, a material that exhibits signatures of topological superconductivity, and Majorana bound states at vortex cores or at impurity locations. We use a superconducting STM tip for enhanced energy resolution, which enables us to show that impurity states can be tuned through the Fermi level with varying tip-sample distance. We find that the impurity state is of the Yu-Shiba-Rusinov (YSR) type, and argue that the energy shift is caused by the low superfluid density in FeTe0.55Se0.45, which allows the electric field of the tip to slightly penetrate the sample. We model the newly introduced tip-gating scenario within the single-impurity Anderson model and find good agreement to the experimental data.

Date: 2021
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DOI: 10.1038/s41467-020-20529-x

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