Large spatial extension of the zero-energy Yu–Shiba–Rusinov state in a magnetic field

Zoltán Scherübl, Gergő Fülöp, Cătălin Paşcu Moca, Jörg Gramich, Andreas Baumgartner, Péter Makk, Tosson Elalaily, Christian Schönenberger, Jesper Nygård, Gergely Zaránd and Szabolcs Csonka ()
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Zoltán Scherübl: Budapest University of Technology and Economics and MTA-BME “Momentum” Nanoelectronics Research Group
Gergő Fülöp: Budapest University of Technology and Economics and MTA-BME “Momentum” Nanoelectronics Research Group
Cătălin Paşcu Moca: Department of Theoretical Physics, Budapest University of Technology and Economics
Jörg Gramich: University of Basel
Andreas Baumgartner: University of Basel
Péter Makk: Budapest University of Technology and Economics and MTA-BME “Momentum” Nanoelectronics Research Group
Tosson Elalaily: Budapest University of Technology and Economics and MTA-BME “Momentum” Nanoelectronics Research Group
Christian Schönenberger: University of Basel
Jesper Nygård: Niels Bohr Institute, University of Copenhagen
Gergely Zaránd: Department of Theoretical Physics, Budapest University of Technology and Economics
Szabolcs Csonka: Budapest University of Technology and Economics and MTA-BME “Momentum” Nanoelectronics Research Group

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Various promising qubit concepts have been put forward recently based on engineered superconductor subgap states like Andreev bound states, Majorana zero modes or the Yu-Shiba-Rusinov (Shiba) states. The coupling of these subgap states via a superconductor strongly depends on their spatial extension and is an essential next step for future quantum technologies. Here we investigate the spatial extension of a Shiba state in a semiconductor quantum dot coupled to a superconductor. With detailed transport measurements and numerical renormalization group calculations we find a remarkable more than 50 nm extension of the zero energy Shiba state, much larger than the one observed in very recent scanning tunneling microscopy measurements. Moreover, we demonstrate that its spatial extension increases substantially in a magnetic field.

Date: 2020
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DOI: 10.1038/s41467-020-15322-9

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