Resonant Oscillations of Josephson Current in Nb‐Bi 2 Te 2.3 Se 0.7 ‐Nb Junctions

Josephson proximity junctions and devices employing topological insulators are promising candidates for realizing topological superconductivity and topologically protected quantum circuits. Here, the new type of oscillations of the critical Josephson current in the ballistic Nb‐Bi 2 Te 2.3 Se 0.7 ‐N...

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Bibliographic Details
Published inAdvanced quantum technologies (Online) Vol. 5; no. 3
Main Authors Stolyarov, Vasily S., Roditchev, Dimitri, Gurtovoi, Vladimir L., Kozlov, Sergey N., Yakovlev, Dmitriy S., Skryabina, Olga V., Vinokur, Valerii M., Golubov, Alexander A.
Format Journal Article
LanguageEnglish
Published Wiley 01.03.2022
Subjects
Engineering Sciences
Micro and nanotechnologies
Microelectronics
andreev bound state
topological insulator
Josephson junction
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Summary:Josephson proximity junctions and devices employing topological insulators are promising candidates for realizing topological superconductivity and topologically protected quantum circuits. Here, the new type of oscillations of the critical Josephson current in the ballistic Nb‐Bi 2 Te 2.3 Se 0.7 ‐Nb junctions subject to the magnetic fields is reported. The oscillations appear below ≈400 mK and have a very unusual sharp‐peaked shape. Their ultra‐short period ≈1 Oe, by orders of magnitude shorter than the expected periodicity due to fluxoid quantization in the device, corresponds to the extremely low energy scale ≈1 eV. It is established that the observed effect is due to the resonant transmission of Andreev quasiparticles via the peculiar energy levels forming near the S‐TI interfaces.
ISSN:2511-9044
2511-9044
DOI:10.1002/qute.202100124