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

Scherübl, Zoltán and Fülöp, Gergő and Moca, Cătălin Paşcu and Gramich, Jörg and Baumgartner, Andreas and Makk, Péter and Elalaily, Tosson and Schonenberger, Christian and Nygård, Jesper and Zaránd, Gergely and Csonka, Szabolcs. (2020) Large spatial extension of the zero-energy Yu-Shiba-Rusinov state in a magnetic field. Nature Communications, 11 (1). p. 1834.

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Official URL: https://edoc.unibas.ch/80426/

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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 50nm 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. Local magnetic moments coupled to superconductors can form subgap Yu-Shiba-Rusinov states. Here the authors show that Shiba states made with an InAs nanowire quantum dot have large spatial extent, which is beneficial for making Shiba chains that are predicted to host Majorana zero modes.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Fülöp, Gergö and Gramich, Jörg Benedikt and Baumgartner, Andreas and Makk, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Apr 2021 13:01
Deposited On:14 Apr 2021 13:01

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