G. Steffensen
University of Copenhagen
13 Papers
43 Citations
G. Steffensen is an academic researcher from University of Copenhagen. The author has contributed to research in topics: Superconductivity & Anderson impurity model. The author has an hindex of 6, co-authored 8 publications.
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Papers
Yu-Shiba-Rusinov screening of spins in double quantum dots
Kasper Grove-Rasmussen,G. Steffensen,A. Jellinggaard,Morten Hannibal Madsen,Rok Žitko,Rok Žitko,Jens Paaske,Jesper Nygård +7 more
TL;DR: A double quantum dot with a Yu–Shiba–Rusinov ground state arising from the interplay of Coulomb interactions and superconductivity is presented, finding excellent agreement with a simple zero-bandwidth approximation, and with numerical renormalization group calculations for the two-orbital Anderson model.
Yu-Shiba-Rusinov screening of spins in double quantum dots.
Kasper Grove-Rasmussen,G. Steffensen,A. Jellinggaard,Morten Hannibal Madsen,Rok Žitko,Rok Žitko,Jens Paaske,Jesper Nygård +7 more
TL;DR: In this paper, double quantum dots are coupled to a superconductor and shown to exhibit lines of zero-energy YSR states with bound quasiparticles screening the impurity spin by ħ/2.
Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$
Damianos Chatzopoulos,Doohee Cho,Koen M. Bastiaans,G. Steffensen,Damian Bouwmeester,Alireza Akbari,Genda Gu,Jens Paaske,Brian M. Andersen,Milan P. Allan +9 more
TL;DR: The authors detect spatially dispersing Yu-Shiba-Rusinov states which can be tuned using an STM tip with varying tip-sample distance, and model the newly introduced tip-gating scenario within the single-impurity Anderson model and find good agreement to the experimental data.
Joule spectroscopy of hybrid superconductor–semiconductor nanodevices
Alexander Iribar Ibabe,Matias Gomez,G. Steffensen,Thomas Kanne,Jesper Nygård,A. Levy Yeyati,E. H. Lee +6 more
TL;DR: In this paper , measurements of the superconductor-to-normal transition originating from Joule heating provide a powerful spectroscopical tool to characterize such hybrid devices, highlighting the large variability present in these systems.
Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe0.55Se0.45.
Damianos Chatzopoulos,Doohee Cho,Koen M. Bastiaans,G. Steffensen,Damian Bouwmeester,Damian Bouwmeester,Alireza Akbari,Genda Gu,Jens Paaske,Brian M. Andersen,Milan P. Allan +10 more
TL;DR: By using scanning tunneling microscopy (STM) to 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, the impurity state is of the Yu-Shiba-Rusinov (YSR) type.