Abstract:
:A magnetic impurity coupled to a superconductor gives rise to a Yu-Shiba-Rusinov (YSR) state inside the superconducting energy gap. With increasing exchange coupling the excitation energy of this state eventually crosses zero and the system switches to a YSR ground state with bound quasiparticles screening the impurity spin by ħ/2. Here we explore indium arsenide (InAs) nanowire double quantum dots tunnel coupled to a superconductor and demonstrate YSR screening of spin-1/2 and spin-1 states. Gating the double dot through nine different charge states, we show that the honeycomb pattern of zero-bias conductance peaks, archetypal of double dots coupled to normal leads, is replaced by lines of zero-energy YSR states. These enclose regions of YSR-screened dot spins displaying distinctive spectral features, and their characteristic shape and topology change markedly with tunnel coupling strengths. We find excellent agreement with a simple zero-bandwidth approximation, and with numerical renormalization group calculations for the two-orbital Anderson model.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Grove-Rasmussen K,Steffensen G,Jellinggaard A,Madsen MH,Žitko R,Paaske J,Nygård Jdoi
10.1038/s41467-018-04683-xsubject
Has Abstractpub_date
2018-06-18 00:00:00pages
2376issue
1issn
2041-1723pii
10.1038/s41467-018-04683-xjournal_volume
9pub_type
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