Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe0.55Se0.45
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Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe0.55Se0.45. / Chatzopoulos, Damianos; Cho, Doohee; Bastiaans, Koen M.; Steffensen, Gorm O.; Bouwmeester, Damian; Akbari, Alireza; Gu, Genda; Paaske, Jens; Andersen, Brian M.; Allan, Milan P.
I: Nature Communications, Bind 12, Nr. 1, 298, 12.01.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe0.55Se0.45
AU - Chatzopoulos, Damianos
AU - Cho, Doohee
AU - Bastiaans, Koen M.
AU - Steffensen, Gorm O.
AU - Bouwmeester, Damian
AU - Akbari, Alireza
AU - Gu, Genda
AU - Paaske, Jens
AU - Andersen, Brian M.
AU - Allan, Milan P.
PY - 2021/1/12
Y1 - 2021/1/12
N2 - 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.
AB - 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.
KW - IMPURITY STATES
KW - FERMIONS
KW - VISUALIZATION
KW - FLUCTUATIONS
KW - CONDUCTANCE
U2 - 10.1038/s41467-020-20529-x
DO - 10.1038/s41467-020-20529-x
M3 - Journal article
C2 - 33436594
VL - 12
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 298
ER -
ID: 278482759