Mapping the topological proximity-induced gap in multiterminal Josephson junctions
ORAL
Abstract
The energy of an Andreev bound state in a clean normal metal in contact with two superconductors disperses with the phase difference φ between superconducting leads similar to the energy of electrons in a 1D crystal lattice with quasimomentum k. A normal metal with n superconducting contacts maps onto a n-1 dimensional artificial crystal which has led to the proposal that multiterminal Josephson junctions (MTJJs) with n≥3 could host topological states [1]. In the devices studied here, topological nature of MTJJs manifests as a modulation of the quasiparticle density of states (DOS) in the normal metal that may be probed by tunneling measurements [2]. We show that one can reveal this modulation by measuring the resistance of diffusive MTJJs with normal contacts, which shows rich structure as a function of the phase differences φi [3]. Our approach demonstrates a simple yet powerful technique for exploring topological effects in MTJJs.
[1] Riwar, RP. et al. Nat Commun 7, 11167 (2016).
[2] Strambini, E. et al. Nature Nanotech 11, 1055–1059 (2016).
[3] Wisne, M. et al. Accepted, Phys. Rev. Lett. (2024) arXiv:2408.09023
[1] Riwar, RP. et al. Nat Commun 7, 11167 (2016).
[2] Strambini, E. et al. Nature Nanotech 11, 1055–1059 (2016).
[3] Wisne, M. et al. Accepted, Phys. Rev. Lett. (2024) arXiv:2408.09023
*This research was conducted with support from the National Science Foundation under grant No. DMR-2303536 and from the European Union's Horizon 2020 Research and Innovation Programme, under Grant No. 824109 (EMP). IMAL and PJH acknowledge support by the Research Council of Finland Project Nos. 341913 (EFT), 352926 (QTF), and by the Jane and Aatos Erkko Foundation and the Keele Foundation (SuperC project).
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Publication: Wisne, M. et al. Accepted, Phys. Rev. Lett. (2024) arXiv:2408.09023
Presenters
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Maxwell Wisne
- Northwestern University