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Article Dans Une Revue Communications Materials Année : 2020

Josephson current mediated by ballistic topological states in Bi2Te2.3Se0.7 single nanocrystals

Vasily Stolyarov
Dmitry Yakovlev
Sergei Kozlov
Olga Skryabina
Dmitry Lvov
Amir Gumarov
Olga Emelyanova
  • Fonction : Auteur
Pavel Dzhumaev
Igor Shchetinin
  • Fonction : Auteur
Razmik Hovhannisyan
Sergey Egorov
  • Fonction : Auteur
Andrey Kokotin
  • Fonction : Auteur
Walter Pogosov
  • Fonction : Auteur
Valery Ryazanov
  • Fonction : Auteur
Mikhail Yu. Kupriyanov
Alexander. Golubov

Résumé

Abstract Superconducting proximity devices using low-dimensional semiconducting elements enable a ballistic regime in the proximity transport. The use of topological insulators in such devices is considered promising owing to the peculiar transport properties these materials offer, as well the hope of inducing topological superconductivity and Majorana phenomena via proximity effects. Here we demonstrate the fabrication and superconducting properties of proximity Josephson devices integrating nanocrystals single of Bi 2 Te 2.3 Se 0.7 with a thickness of a few unit cells. Single junctions display typical characteristics of planar Josephson devices; junctions integrating two nanocrystals behave as nanodimensional superconducting quantum interference devices. A peculiar temperature and magnetic field evolution of the Josephson current along with the observed excess current effect point towards the ballistic proximity regime of topological channels. This suggests the proposed devices are promising for testing topological superconducting phenomena in two-dimensions.

Dates et versions

hal-04020813 , version 1 (09-03-2023)

Identifiants

Citer

Vasily Stolyarov, Dmitry Yakovlev, Sergei Kozlov, Olga Skryabina, Dmitry Lvov, et al.. Josephson current mediated by ballistic topological states in Bi2Te2.3Se0.7 single nanocrystals. Communications Materials, 2020, 1 (1), pp.38. ⟨10.1038/s43246-020-0037-y⟩. ⟨hal-04020813⟩
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