DSpace Repository

Quantum oscillations in topological insulator microwires contacted with superconducting In2Bi leads

Show simple item record

dc.contributor.author KONOPKO, Leonid
dc.contributor.author NIKOLAEVA, Albina
dc.contributor.author HUBER, Tito
dc.date.accessioned 2024-04-25T12:38:12Z
dc.date.available 2024-04-25T12:38:12Z
dc.date.issued 2024
dc.identifier.citation KONOPKO, Leonid, NIKOLAEVA, Albina, HUBER,Tito. Quantum oscillations in topological insulator microwires contacted with superconducting In2Bi leads. In: Quo Vadis – Ethics of the Scientific Research: conf. NANO-2024, event devoted to the 60th anniversary of the Technical University of Moldova, 15-18 April 2024, Chişinău, Republica Moldova: Program and proceedings of the conference, Chişinău 2024, pp. 81-82. ISBN 978-9975-64-422-8. en_US
dc.identifier.isbn 978-9975-64-422-8
dc.identifier.uri http://repository.utm.md/handle/5014/26924
dc.description.abstract Here 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) [1,2]. 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 (longitudinal and transverse) of magnetic field. en_US
dc.language.iso en en_US
dc.publisher Technical University of Moldova en_US
dc.relation.ispartofseries NANO-2024 "Quo Vadis – Ethics of the Scientific Research", event devoted to the 60th anniversary of the Technical University of Moldova;15-18 April 2024, Chişinău, Republica Moldova
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject magnetoresistance en_US
dc.subject polycrystal Bi2Te2Se en_US
dc.subject topological insulator en_US
dc.title Quantum oscillations in topological insulator microwires contacted with superconducting In2Bi leads en_US
dc.type Article en_US


Files in this item

The following license files are associated with this item:

This item appears in the following Collection(s)

Show simple item record

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

Search DSpace


Advanced Search

Browse

My Account