Twofold symmetry of proximityinduced superconductivity in ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}/{\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\delta}$ heterostructures revealed by scanning tunneling microscopy
Abstract
We observe proximityinduced superconductivity in in situ prepared heterostructures constructed by topological insulator Bi_{2}Te_{3} thin films and hightemperature cuprate superconductors Bi_{2}Sr_{2} CaCu_{2}O_{8+δ}. The superconducting gap maximum is about 7.6 meV on the surface of Bi_{2}Te_{3} 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 Bi_{2}Te_{3}. 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 hightemperature superconducting cuprates.
 Authors:

 Nanjing Univ. (China)
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Publication Date:
 Research Org.:
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES)
 OSTI Identifier:
 1637481
 Report Number(s):
 BNL2161102020JAAM
Journal ID: ISSN 24699950; PRBMDO; TRN: US2201624
 Grant/Contract Number:
 SC0012704
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 101; Journal Issue: 22; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Wan, Siyuan, Gu, Qiangqiang, Li, Huazhou, Yang, Huan, Schneeloch, J., Zhong, R. D., Gu, G. D., and Wen, HaiHu. Twofold symmetry of proximityinduced superconductivity in Bi2Te3/Bi2Sr2CaCu2O8+δ heterostructures revealed by scanning tunneling microscopy. United States: N. p., 2020.
Web. doi:10.1103/PhysRevB.101.220503.
Wan, Siyuan, Gu, Qiangqiang, Li, Huazhou, Yang, Huan, Schneeloch, J., Zhong, R. D., Gu, G. D., & Wen, HaiHu. Twofold symmetry of proximityinduced superconductivity in Bi2Te3/Bi2Sr2CaCu2O8+δ heterostructures revealed by scanning tunneling microscopy. United States. https://doi.org/10.1103/PhysRevB.101.220503
Wan, Siyuan, Gu, Qiangqiang, Li, Huazhou, Yang, Huan, Schneeloch, J., Zhong, R. D., Gu, G. D., and Wen, HaiHu. Mon .
"Twofold symmetry of proximityinduced superconductivity in Bi2Te3/Bi2Sr2CaCu2O8+δ heterostructures revealed by scanning tunneling microscopy". United States. https://doi.org/10.1103/PhysRevB.101.220503. https://www.osti.gov/servlets/purl/1637481.
@article{osti_1637481,
title = {Twofold symmetry of proximityinduced superconductivity in Bi2Te3/Bi2Sr2CaCu2O8+δ heterostructures revealed by scanning tunneling microscopy},
author = {Wan, Siyuan and Gu, Qiangqiang and Li, Huazhou and Yang, Huan and Schneeloch, J. and Zhong, R. D. and Gu, G. D. and Wen, HaiHu},
abstractNote = {We observe proximityinduced superconductivity in in situ prepared heterostructures constructed by topological insulator Bi2Te3 thin films and hightemperature cuprate superconductors Bi2Sr2 CaCu2O8+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 Δ4y 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 hightemperature superconducting cuprates.},
doi = {10.1103/PhysRevB.101.220503},
journal = {Physical Review B},
number = 22,
volume = 101,
place = {United States},
year = {2020},
month = {6}
}
Web of Science
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