Massive Suppression of Proximity Pairing in Topological (Bi1-xSbx)2Te3 Films on Niobium

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.

doi:10.1103/PhysRevLett.124.236402

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

Journal Article · Fri Jun 12 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.236402· OSTI ID:1633111

^[1]; Najafzadeh, Sahand ^[2];

^[1]; Hashimoto, Takahiro ^[2]; Nagashima, Tsubaki ^[2]; Tsuzuki, Akihiro ^[2]; Fukushima, Akiko ^[2]; Bareille, Cédric ^[2]; Bai, Yang ^[1];

^[3]; Liu, Ro-Ya ^[4];

^[1]; Flötotto, David ^[5]; Avila, José ^[6];

^[1]; Shin, Shik ^[2]; Okazaki, Kozo ^[2];

^[1]

Univ. of Illinois at Urbana-Champaign, IL (United States)
Univ. of Tokyo (Japan)
Univ. of Illinois at Urbana-Champaign, IL (United States); Shanghai Jiao Tong Univ. (China)
Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Münster (Germany)
Univ. Paris-Saclay, Gif-sur-Yvette (France); Synchrotron SOLEIL, Paris (France)

Interfacing bulk conducting topological Bi₂Se₃ films with s-wave superconductors initiates strong superconducting order in the nontrivial surface states. Yet, bulk insulating topological (Bi_1-xSb_x)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.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: FG02-07ER46383; W911NF-19-1-0067; DMR 18-36710; ANR-17-CE09-0016-05

OSTI ID:: 1633111

Journal Information:: Physical Review Letters, Vol. 124, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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77 NANOSCIENCE AND NANOTECHNOLOGY
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molecular beam epitaxy (MBE)
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Title: Massive Suppression of Proximity Pairing in Topological ( Bi 1 - x Sb x ) 2 Te 3 Films on Niobium

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