期刊
NANO LETTERS
卷 21, 期 15, 页码 6518-6524出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01703
关键词
Hybrid symmetry epitaxy; Superconductor/topological insulator heterostructure; Fe(Te,Se)/Bi2Te3; Uniaxial lattice match; Superconductivity
类别
资金
- National Science Foundation [DMR2004125]
- Army Research Office (ARO) [W911NF-20-1-0108]
- center for Quantum Materials Synthesis (cQMS) - Gordon and Betty Moore Foundation's EPiQS initiative [GBMF6402]
- U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers
- Basic Energy Sciences, Materials Sciences and Engineering Division
- Materials Science and Engineering Divisions, Office of Basic Energy Sciences of the U.S. Department of Energy [DESC0012704]
This study demonstrates a new method for growing a 4-fold compound superconductor on a 6-fold topological insulator, known as hybrid symmetry epitaxy, critical for stabilizing robust superconductivity.
It is challenging to grow an epitaxial 4-fold compound superconductor (SC) on a 6-fold topological insulator (TI) platform due to the stringent lattice-matching requirement. Here, we demonstrate that Fe(Te,Se) can grow epitaxially on a TI (Bi2Te3) layer due to accidental, uniaxial lattice match, which is dubbed as hybrid symmetry epitaxy. This new growth mode is critical to stabilizing robust superconductivity with TC as high as 13 K. Furthermore, the superconductivity in this FeTe1-xSex/Bi2Te3 system survives in the Te-rich phase with Se content as low as x = 0.03 but vanishes at Se content above x = 0.56, exhibiting a phase diagram that is quite different from that of the conventional Fe(Te,Se) systems. This unique heterostructure platform that can be formed in both TI-on-SC and SC-on-TI sequences opens a route to unprecedented topological heterostructures.
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