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

Vasily S. Stolyarov*, Dmitry Yakovlev, S. N. Kozlov, Olga V. Skryabina, Dmitry S. Lvov, Amir I. Gumarov, O.V. Emelyanova, P. S. Dzhumaev, I. V. Shchetinin, R. A. Hovhannisyan, S. V. Egorov, Andrey M. Kokotin, Walter V. Pogosov, Valery V. Ryazanov, Mikhail Yu. Kupriyanov, A.A. Golubov, Dimitri Roditchev

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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 Bi2Te2.3Se0.7 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.
Original languageEnglish
Article number38
Pages (from-to)1-11
Number of pages11
JournalCommunications Materials
Publication statusPublished - 2 Jul 2020


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