Strong spin–orbit semiconductor nanowires coupled to a superconductor are predicted to host Majorana zero modes. Exchange (braiding) operations of Majorana modes form the logical gates of a topological quantum computer and require a network of nanowires. Here, we utilize an in-plane selective area growth technique for InSb–Al semiconductor–superconductor nanowire networks. Transport channels, free from extended defects, in InSb nanowire networks are realized on insulating, but heavily mismatched InP (111)B substrates by full relaxation of the lattice mismatch at the nanowire/substrate interface and nucleation of a complete network from a single nucleation site by optimizing the surface diffusion length of the adatoms. Essential quantum transport phenomena for topological quantum computing are demonstrated in these structures including phase-coherence lengths exceeding several micrometers with Aharonov–Bohm oscillations up to five harmonics and a hard superconducting gap accompanied by 2e-periodic Coulomb oscillations with an Al-based Cooper pair island integrated in the nanowire network.

Op het Veld, R., Xu, D., Schaller, V., Verheijen, M., Peters, S., Jung, J., et al. (2020). In-plane selective area InSb–Al nanowire quantum networks. COMMUNICATIONS PHYSICS, 3(1) [10.1038/s42005-020-0324-4].

In-plane selective area InSb–Al nanowire quantum networks

Sarikov, Andrey;Marzegalli, Anna;Miglio, Leo;
2020

Abstract

Strong spin–orbit semiconductor nanowires coupled to a superconductor are predicted to host Majorana zero modes. Exchange (braiding) operations of Majorana modes form the logical gates of a topological quantum computer and require a network of nanowires. Here, we utilize an in-plane selective area growth technique for InSb–Al semiconductor–superconductor nanowire networks. Transport channels, free from extended defects, in InSb nanowire networks are realized on insulating, but heavily mismatched InP (111)B substrates by full relaxation of the lattice mismatch at the nanowire/substrate interface and nucleation of a complete network from a single nucleation site by optimizing the surface diffusion length of the adatoms. Essential quantum transport phenomena for topological quantum computing are demonstrated in these structures including phase-coherence lengths exceeding several micrometers with Aharonov–Bohm oscillations up to five harmonics and a hard superconducting gap accompanied by 2e-periodic Coulomb oscillations with an Al-based Cooper pair island integrated in the nanowire network.
Articolo in rivista - Articolo scientifico
InSb-Al nanowires
English
Published: 26 March 2020
Op het Veld, R., Xu, D., Schaller, V., Verheijen, M., Peters, S., Jung, J., et al. (2020). In-plane selective area InSb–Al nanowire quantum networks. COMMUNICATIONS PHYSICS, 3(1) [10.1038/s42005-020-0324-4].
Op het Veld, R; Xu, D; Schaller, V; Verheijen, M; Peters, S; Jung, J; Tong, C; Wang, Q; de Moor, M; Hesselmann, B; Vermeulen, K; Bommer, J; Sue Lee, J; Sarikov, A; Pendharkar, M; Marzegalli, A; Koelling, S; Kouwenhoven, L; Miglio, L; Palmstrøm, C; Zhang, H; Bakkers, E
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/267241
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