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Quantum Oscillations in Topological Insulator Bi2Te2Se Microwires Contacted with Superconducting In2Bi Leads

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dc.contributor.author KONOPKO, Leonid
dc.contributor.author NIKOLAEVA, Albina
dc.contributor.author HUBER, Tito
dc.date.accessioned 2023-11-06T10:44:03Z
dc.date.available 2023-11-06T10:44:03Z
dc.date.issued 2023
dc.identifier.citation KONOPKO, Leonid, NIKOLAEVA, Albina, HUBER, Tito. Quantum Oscillations in Topological Insulator Bi2Te2Se Microwires Contacted with Superconducting In2Bi Leads. In: 6th International Conference on Nanotechnologies and Biomedical Engineering: proc. of ICNBME-2023, 20–23, 2023, Chisinau, vol. 1: Nanotechnologies and Nano-biomaterials for Applications in Medicine, 2023, p. 293-302. ISBN 978-3-031-42774-9. e-ISBN 978-3-031-42775-6. en_US
dc.identifier.isbn 978-3-031-42774-9
dc.identifier.isbn 978-3-031-42775-6
dc.identifier.uri https://doi.org/10.1007/978-3-031-42775-6_33
dc.identifier.uri http://repository.utm.md/handle/5014/24643
dc.description Acces full text - https://doi.org/10.1007/978-3-031-42775-6_33 en_US
dc.description.abstract We studied the magnetoresistance (MR) of polycrystal Bi2Te2Se topological insulator (TI) microwires contacted with superconducting In2Bi leads. Bi2Te2Se has a simple band structure with a single Dirac cone on the surface and a large non-trivial bulk gap of 300 meV. To study the TI/SC interface, the Bi2Te2Se glass-coated microwire with a diameter of d = 17 µm was connected to copper leads on one side using superconducting alloy In2Bi (Tc = 5.6 K), and on the other side using gallium. The topologically nontrivial 3D superconductor (SC) In2Bi has proximity-induced superconductivity of topological surface states. To eliminate conventional contribution to superconductivity from the bulk, the resulting edge states of the TI/SC contact area were studied in magnetic fields above Hc2 in In2Bi. The h/2e oscillations of magnetoresistance (MR) in longitudinal and transverse magnetic fields (up to 1 T) at the TI/SC interface were observed at various temperatures (4.2 k–1.5 K). To explain the observed oscillations, we used magnetic flux quantization, which requires a multiply connected geometry where flux can penetrate into normal regions surrounded by a superconductor. The effective width of the closed superconducting area of the TI/SC interface is determined to be 15 nm from an analysis of FFT spectra and the beats of the MR oscillations for two different directions of magnetic field. en_US
dc.language.iso en en_US
dc.publisher Springer Nature Switzerland en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject topological insulators en_US
dc.subject superconductivity en_US
dc.subject thin microwires en_US
dc.subject proximity effect en_US
dc.subject magnetoresistance en_US
dc.subject oscillations of magnetoresistance en_US
dc.title Quantum Oscillations in Topological Insulator Bi2Te2Se Microwires Contacted with Superconducting In2Bi Leads en_US
dc.type Article en_US


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  • 2023
    6th International Conference on Nanotechnologies and Biomedical Engineering, September 20–23, 2023, Chisinau, Moldova

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Attribution-NonCommercial-NoDerivs 3.0 United States Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 United States

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