Twofold symmetry of proximity-induced superconductivity in Bi2Te3/Bi2Sr2CaCu2O8+δ heterostructures revealed by scanning tunneling microscopy

Wan, Siyuan; Gu, Qiangqiang; Li, Huazhou; Yang, Huan; Schneeloch, J.; Zhong, R. D.; Gu, G. D.; Wen, Hai-Hu

doi:10.1103/PhysRevB.101.220503

Twofold symmetry of proximity-induced superconductivity in ${Bi}_{2} {Te}_{3} / {Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$ heterostructures revealed by scanning tunneling microscopy

Journal Article · Mon Jun 08 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.101.220503· OSTI ID:1637481

^[1]; ^[1]; Li, Huazhou ^[1]; Yang, Huan ^[1]; Schneeloch, J. ^[2]; Zhong, R. D. ^[2]; Gu, G. D. ^[2]; Wen, Hai-Hu ^[1]

Nanjing Univ. (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)

We observe proximity-induced superconductivity in in situ prepared heterostructures constructed by topological insulator Bi₂Te₃ thin films and high-temperature cuprate superconductors Bi₂Sr₂ CaCu₂O_8+δ. The superconducting gap maximum is about 7.6 meV on the surface of Bi₂Te₃ thin films with a thickness of two quintuple layers, and the gap value decreases with an increase in the film thickness. Moreover, the quasiparticle interference data show clear evidence of a twofold symmetric superconducting gap with gap minima along one pair of the principal crystalline axes of Bi₂Te₃. This gap form is consistent with the Δ_4y notation of the topological superconductivity proposed in such systems. Our results provide fruitful information on the possible topological superconductivity induced by the proximity effect in high-temperature superconducting cuprates.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1637481

Report Number(s):: BNL--216110-2020-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Twofold symmetry of proximity-induced superconductivity in ${Bi}_{2} {Te}_{3} / {Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$ heterostructures revealed by scanning tunneling microscopy