Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface

Moore, Robert G.; Lu, Qiangsheng; Jeon, Hoyeon; Yao, Xiong; Smith, Tyler; Pai, Yun‐Yi; Chilcote, Michael; Miao, Hu; Okamoto, Satoshi; Li, An‐Ping; Oh, Seongshik; Brahlek, Matthew

doi:10.1002/adma.202210940

Title: Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi₂Te₃ Interface

Journal Article · Wed Mar 15 00:00:00 EDT 2023 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202210940· OSTI ID:1972579

^[1]; Lu, Qiangsheng ^[1]; Jeon, Hoyeon ^[1]; Yao, Xiong ^[2]; Smith, Tyler ^[1];

^[1]; Chilcote, Michael ^[1];

^[1];

^[1]; Oh, Seongshik ^[2];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rutgers Univ., Piscataway, NJ (United States)

Abstract The interface between 2D topological Dirac states and an s ‐wave superconductor is expected to support Majorana‐bound states (MBS) that can be used for quantum computing applications. Realizing these novel states of matter and their applications requires control over superconductivity and spin‐orbit coupling to achieve spin‐momentum‐locked topological interface states (TIS) which are simultaneously superconducting. While signatures of MBS have been observed in the magnetic vortex cores of bulk FeTe _0.55 Se _0.45 , inhomogeneity and disorder from doping make these signatures unclear and inconsistent between vortices. Here superconductivity is reported in monolayer (ML) FeTe _1–y Se _y (Fe(Te,Se)) grown on Bi ₂ Te ₃ by molecular beam epitaxy (MBE). Spin and angle‐resolved photoemission spectroscopy (SARPES) directly resolve the interfacial spin and electronic structure of Fe(Te,Se)/Bi ₂ Te ₃ heterostructures. For y = 0.25, the Fe(Te,Se) electronic structure is found to overlap with the Bi ₂ Te ₃ TIS and the desired spin‐momentum locking is not observed. In contrast, for y = 0.1, reduced inhomogeneity measured by scanning tunneling microscopy (STM) and a smaller Fe(Te,Se) Fermi surface with clear spin‐momentum locking in the topological states are found. Hence, it is demonstrated that the Fe(Te,Se)/Bi ₂ Te ₃ system is a highly tunable platform for realizing MBS where reduced doping can improve characteristics important for Majorana interrogation and potential applications.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Office (ARO); National Science Foundation (NSF); Gordon and Betty Moore Foundation; USDOE

Grant/Contract Number:: AC05-00OR22725; W911NF2010108; DMR2004125; GBMF10104

OSTI ID:: 1972579

Alternate ID(s):: OSTI ID: 1983445

Journal Information:: Advanced Materials, Vol. 35, Issue 22; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
superconductor
topological superconductor
monolayer superconductivity
molecular beam epitaxy
thin film heterostructure
spin and angle resolved photoemission spectroscopy
scanning tunneling microscopy

Title: Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface

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References (62)

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Title: Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi₂Te₃ Interface