TY - JOUR
T1 - Resonant Oscillations of Josephson Current in Nb-Bi2Te2.3Se0.7-Nb Junctions
AU - Stolyarov, Vasily S.
AU - Roditchev, Dimitri
AU - Gurtovoi, Vladimir L.
AU - Kozlov, Sergey N.
AU - Yakovlev, Dmitriy S.
AU - Skryabina, Olga V.
AU - Vinokur, Valerii M.
AU - Golubov, Alexander A.
N1 - Funding Information:
The authors thank M. Yu. Kupriyanov and Y. Tanaka for fruitful discussions and advice, L. Tagirov and O. Emeyanova for realization of the XPS and EDX analyses of crystals, and D. Lvov and S. Egorov for technical support during the sample fabrication and measurements. The transport experiments were carried out with the support of the RSF‐ANR grant CrysTop (20‐42‐09033). The sample preparation was realized with the support of the RSF (21‐72‐00140). D.R. acknowledges COST Action CA16218 ‐ Nanoscale Coherent Hybrid Devices for Superconducting Quantum Technologies, French ANR grant SUPERSTRIPES. V.L.G acknowledges support by the State task 075‐00475‐19‐00 IMT RAS. The work of V.M.V. was supported by Terra Quantum AG. A.A.G. acknowledges support by the European Union H2020‐WIDESPREAD‐05‐2017‐Twinning project SPINTECH under Grant Agreement No. 810144. This work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (No. FSMG‐2021‐0005).
Funding Information:
The authors thank M. Yu. Kupriyanov and Y. Tanaka for fruitful discussions and advice, L. Tagirov and O. Emeyanova for realization of the XPS and EDX analyses of crystals, and D. Lvov and S. Egorov for technical support during the sample fabrication and measurements. The transport experiments were carried out with the support of the RSF-ANR grant CrysTop (20-42-09033). The sample preparation was realized with the support of the RSF (21-72-00140). D.R. acknowledges COST Action CA16218 - Nanoscale Coherent Hybrid Devices for Superconducting Quantum Technologies, French ANR grant SUPERSTRIPES. V.L.G acknowledges support by the State task 075-00475-19-00 IMT RAS. The work of V.M.V. was supported by Terra Quantum AG. A.A.G. acknowledges support by the European Union H2020-WIDESPREAD-05-2017-Twinning project SPINTECH under Grant Agreement No. 810144. This work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (No. FSMG-2021-0005).
Publisher Copyright:
© 2022 The Authors. Advanced Quantum Technologies published by Wiley-VCH GmbH
Financial transaction number:
802185241
PY - 2022/3
Y1 - 2022/3
N2 - 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-Bi2Te2.3Se0.7-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 (Formula presented.) 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.
AB - 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-Bi2Te2.3Se0.7-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 (Formula presented.) 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.
KW - andreev bound state
KW - Josephson junction
KW - topological insulator
UR - http://www.scopus.com/inward/record.url?scp=85123783130&partnerID=8YFLogxK
U2 - 10.1002/qute.202100124
DO - 10.1002/qute.202100124
M3 - Article
AN - SCOPUS:85123783130
VL - 5
JO - Advanced Quantum Technologies
JF - Advanced Quantum Technologies
SN - 2511-9044
IS - 3
M1 - 2100124
ER -