Hybrid Symmetry Epitaxy of the Superconducting Fe(Te,Se) Film on a Topological Insulator

Xiong Yao; Matthew Brahlek; Hee Taek Yi; Deepti Jain; Alessandro R. Mazza; Myung Geun Han; Seongshik Oh

doi:10.1021/acs.nanolett.1c01703

Hybrid Symmetry Epitaxy of the Superconducting Fe(Te,Se) Film on a Topological Insulator

Xiong Yao, Matthew Brahlek, Hee Taek Yi, Deepti Jain, Alessandro R. Mazza, Myung Geun Han, Seongshik Oh

Quantum Heterostructures

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	6518-6524
Number of pages	7
Journal	Nano Letters
Volume	21
Issue number	15
DOIs	https://doi.org/10.1021/acs.nanolett.1c01703
State	Published - Aug 11 2021

Funding

This work is supported by National Science Foundation’s DMR2004125, Army Research Office (ARO) Grant No. W911NF-20-1-0108, the center for Quantum Materials Synthesis (cQMS), funded by the Gordon and Betty Moore Foundation’s EPiQS initiative through grant GBMF6402, and the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers and the Basic Energy Sciences, Materials Sciences and Engineering Division. The work at Brookhaven National Laboratory is supported by the Materials Science and Engineering Divisions, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DESC0012704. FIB use at the Center for Functional Nanomaterials, Brookhaven National Laboratory ,is acknowledged.

Funders	Funder number
National Quantum Information Science Research Centers
National Science Foundation	DMR2004125
U.S. Department of Energy
Army Research Office	W911NF-20-1-0108
Gordon and Betty Moore Foundation	GBMF6402
Office of Science
Basic Energy Sciences	DESC0012704
Division of Materials Sciences and Engineering

Keywords

Fe(Te,Se)/BiTe
Hybrid symmetry epitaxy
Superconductivity
Superconductor/topological insulator heterostructure
Uniaxial lattice match

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10.1021/acs.nanolett.1c01703

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title = "Hybrid Symmetry Epitaxy of the Superconducting Fe(Te,Se) Film on a Topological Insulator",

abstract = "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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AU - Jain, Deepti

AU - Mazza, Alessandro R.

AU - Han, Myung Geun

AU - Oh, Seongshik

PY - 2021/8/11

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N2 - 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.

AB - 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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Hybrid Symmetry Epitaxy of the Superconducting Fe(Te,Se) Film on a Topological Insulator

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