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  Competing energy scales in topological superconducting heterostructures

Zang, Y., Küster, F., Zhang, J., Liu, D., Pal, B., Deniz, H., et al. (2021). Competing energy scales in topological superconducting heterostructures. Nano Letters, 21(7), 2758-2765. doi:10.1021/acs.nanolett.0c04648.

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https://doi.org/10.1021/acs.nanolett.0c04648 (Publisher version)
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 Creators:
Zang , Yunyi1, Author
Küster, Felix1, Author           
Zhang, Jibo1, Author           
Liu, Defa1, Author           
Pal, Banabir1, Author           
Deniz, Hakan1, Author           
Sessi, Paolo1, Author           
Gilbert, Matthew J.2, Author
Parkin, Stuart S. P.1, Author                 
Affiliations:
1Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              
2External Organizations, ou_persistent22              

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Free keywords: SINGLE DIRAC CONE; SURFACE-STATES; BI2SE3; BI2TE3; FILMS; GAPChemistry; Science & Technology - Other Topics; Materials Science; Physics; Topological superconductors; heterostructures; Majorana modes; trivial modes;
 Abstract: Artificially engineered topological superconductivity has emerged as a viable route to create Majorana modes. In this context, proximity-induced super-conductivity in materials with a sizable spin-orbit coupling has been intensively investigated in recent years. Although there is convincing evidence that superconductivity may indeed be induced, it has been difficult to elucidate its topological nature. Here, we engineer an artificial topological superconductor by progressively introducing superconductivity (Nb), strong spin-orbital coupling (Pt), and topological states (Bi2Te3). Through spectroscopic imaging of superconducting vortices within the bare s-wave superconducting Nb and within proximitized Pt and Bi2Te3 layers, we detect the emergence of a zero-bias peak that is directly linked to the presence of topological surface states. Our results are rationalized in terms of competing energy trends which are found to impose an upper limit to the size of the minigap separating Majorana and trivial modes, its size being ultimately linked to fundamental materials properties.

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Language(s): eng - English
 Dates: 2021-04-012021-04-14
 Publication Status: Published in print
 Pages: 8
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 Table of Contents: -
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 21 (7) Sequence Number: - Start / End Page: 2758 - 2765 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403