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Title: Massive Suppression of Proximity Pairing in Topological ( Bi 1 - x Sb x ) 2 Te 3 Films on Niobium

Abstract

Interfacing bulk conducting topological Bi2Se3 films with s-wave superconductors initiates strong superconducting order in the nontrivial surface states. Yet, bulk insulating topological (Bi1-xSbx)2Te3 films on bulk Nb instead exhibit a giant attenuation of surface superconductivity, even for films only two-layers thick. This massive suppression of proximity pairing is shown by ultrahigh-resolution band mappings and by contrasting quantified superconducting gaps with those of heavily n-doped topological Bi2Se3/Nb. The results underscore the limitations of using superconducting proximity effects to realize topological superconductivity in nearly intrinsic systems.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [1]; ORCiD logo [3];  [4]; ORCiD logo [1];  [5];  [6]; ORCiD logo [1];  [2];  [2]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
  2. Univ. of Tokyo (Japan)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States); Shanghai Jiao Tong Univ. (China)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of Münster (Germany)
  6. Univ. Paris-Saclay, Gif-sur-Yvette (France); Synchrotron SOLEIL, Paris (France)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Army Research Office (ARO); National Science Foundation (NSF); French National Research Agency (ANR)
OSTI Identifier:
1633111
Grant/Contract Number:  
FG02-07ER46383; W911NF-19-1-0067; DMR 18-36710; ANR-17-CE09-0016-05
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 124; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Topological superconductor; superconducting proximity effect; topological insulators; molecular beam epitaxy (MBE); angle-resolved photoemission spectroscopy (ARPES)

Citation Formats

Hlevyack, Joseph A., Najafzadeh, Sahand, Lin, Meng-Kai, Hashimoto, Takahiro, Nagashima, Tsubaki, Tsuzuki, Akihiro, Fukushima, Akiko, Bareille, Cédric, Bai, Yang, Chen, Peng, Liu, Ro-Ya, Li, Yao, Flötotto, David, Avila, José, Eckstein, James N., Shin, Shik, Okazaki, Kozo, and Chiang, T. -C. Massive Suppression of Proximity Pairing in Topological (Bi1-xSbx)2Te3 Films on Niobium. United States: N. p., 2020. Web. doi:10.1103/PhysRevLett.124.236402.
Hlevyack, Joseph A., Najafzadeh, Sahand, Lin, Meng-Kai, Hashimoto, Takahiro, Nagashima, Tsubaki, Tsuzuki, Akihiro, Fukushima, Akiko, Bareille, Cédric, Bai, Yang, Chen, Peng, Liu, Ro-Ya, Li, Yao, Flötotto, David, Avila, José, Eckstein, James N., Shin, Shik, Okazaki, Kozo, & Chiang, T. -C. Massive Suppression of Proximity Pairing in Topological (Bi1-xSbx)2Te3 Films on Niobium. United States. doi:https://doi.org/10.1103/PhysRevLett.124.236402
Hlevyack, Joseph A., Najafzadeh, Sahand, Lin, Meng-Kai, Hashimoto, Takahiro, Nagashima, Tsubaki, Tsuzuki, Akihiro, Fukushima, Akiko, Bareille, Cédric, Bai, Yang, Chen, Peng, Liu, Ro-Ya, Li, Yao, Flötotto, David, Avila, José, Eckstein, James N., Shin, Shik, Okazaki, Kozo, and Chiang, T. -C. Fri . "Massive Suppression of Proximity Pairing in Topological (Bi1-xSbx)2Te3 Films on Niobium". United States. doi:https://doi.org/10.1103/PhysRevLett.124.236402.
@article{osti_1633111,
title = {Massive Suppression of Proximity Pairing in Topological (Bi1-xSbx)2Te3 Films on Niobium},
author = {Hlevyack, Joseph A. and Najafzadeh, Sahand and Lin, Meng-Kai and Hashimoto, Takahiro and Nagashima, Tsubaki and Tsuzuki, Akihiro and Fukushima, Akiko and Bareille, Cédric and Bai, Yang and Chen, Peng and Liu, Ro-Ya and Li, Yao and Flötotto, David and Avila, José and Eckstein, James N. and Shin, Shik and Okazaki, Kozo and Chiang, T. -C.},
abstractNote = {Interfacing bulk conducting topological Bi2Se3 films with s-wave superconductors initiates strong superconducting order in the nontrivial surface states. Yet, bulk insulating topological (Bi1-xSbx)2Te3 films on bulk Nb instead exhibit a giant attenuation of surface superconductivity, even for films only two-layers thick. This massive suppression of proximity pairing is shown by ultrahigh-resolution band mappings and by contrasting quantified superconducting gaps with those of heavily n-doped topological Bi2Se3/Nb. The results underscore the limitations of using superconducting proximity effects to realize topological superconductivity in nearly intrinsic systems.},
doi = {10.1103/PhysRevLett.124.236402},
journal = {Physical Review Letters},
number = 23,
volume = 124,
place = {United States},
year = {2020},
month = {6}
}

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