Topological states in A15 superconductors

Kim, Minsung; Wang, Cai-Zhuang; Ho, Kai-Ming

doi:10.1103/PhysRevB.99.224506

Title: Topological states in A15 superconductors

Journal Article · Wed Jun 12 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.224506· OSTI ID:1542878

Kim, Minsung ^[1]; Wang, Cai-Zhuang ^[1]; Ho, Kai-Ming ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

Superconductors with the A15 structure are prototypical type-II s-wave superconductors which have generated considerable interest in early superconducting material history. Yet, the topological nature of the electronic structure remains unnoticed so far. In this work, using first-principles band structure calculations based on density-functional theory, we show that the A15 superconductors (Ta₃Sb, Ta₃Sn, and Ta₃Pb) have nontrivial band topology in the bulk electronic band structures, leading to the formation of topological surface states near the Fermi energy. Due to the bulk superconductivity, the proximity effect in the topological surface states would induce topological superconductivity even without heterostructure of a topological insulator and an s-wave superconductor. Our results indicate that the A15 superconductors are promising candidates for the realization of the topological superconductivity and the Majorana fermion.

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Research Organization:: Ames Lab., Ames, IA (United States)

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

Grant/Contract Number:: AC02-07CH11358; AC02-05CH11231

OSTI ID:: 1542878

Alternate ID(s):: OSTI ID: 1546236

Report Number(s):: IS-J-9967; PRBMDO

Journal Information:: Physical Review B, Vol. 99, Issue 22; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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