Spatially Dispersing Yu-Shiba-Rusinov States in the Unconventional Superconductor FeTeSe

Overview

Journal Nat Commun

Specialty Biology

Date 2021 Jan 13

PMID 33436594

Citations 7

Authors

Damianos Chatzopoulos

Doohee Cho

Koen M Bastiaans

Gorm O Steffensen

Damian Bouwmeester

Alireza Akbari

Genda Gu

Jens Paaske

Brian M Andersen

Milan P Allan

Affiliations

Soon will be listed here.

Abstract

By using scanning tunneling microscopy (STM) we find and characterize dispersive, energy-symmetric in-gap states in the iron-based superconductor FeTeSe, 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 FeTeSe, 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.

Citing Articles

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Observation of Yu-Shiba-Rusinov-like states at the edge of CrBr/NbSe heterostructure.

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Hund's coupling mediated multi-channel quantum phase transition of a single magnetic impurity in Fe(Se, Te).

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Single-electron charge transfer into putative Majorana and trivial modes in individual vortices.

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