Electronic properties of the bulk and surface states of Fe1+yTe1−xSex

Yangmu Li; Nader Zaki; Vasile O. Garlea; Andrei T. Savici; David Fobes; Zhijun Xu; Fernando Camino; Cedomir Petrovic; Genda Gu; Peter D. Johnson; John M. Tranquada; Igor A. Zaliznyak

doi:10.1038/s41563-021-00984-7

Electronic properties of the bulk and surface states of Fe_1+yTe_1−xSe_x

Yangmu Li, Nader Zaki, Vasile O. Garlea, Andrei T. Savici, David Fobes, Zhijun Xu, Fernando Camino, Cedomir Petrovic, Genda Gu, Peter D. Johnson, John M. Tranquada, Igor A. Zaliznyak

Direct Geometry

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39 Scopus citations

Abstract

The idea of employing non-Abelian statistics for error-free quantum computing ignited interest in reports of topological surface superconductivity and Majorana zero modes (MZMs) in FeTe_0.55Se_0.45. However, the topological features and superconducting properties are not observed uniformly across the sample surface. The understanding and practical control of these electronic inhomogeneities present a prominent challenge for potential applications. Here, we combine neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe_1+yTe_1−xSe_x. We establish a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, in association with distinct antiferromagnetic correlations, whereas the coexisting topological surface state occurs only at sufficiently high Te concentration. We find that FeTe_0.55Se_0.45 is located very close to both phase boundaries, which explains the inhomogeneity of superconducting and topological states. Our results demonstrate the compositional control required for use of topological MZMs in practical applications.

Original language	English
Pages (from-to)	1221-1227
Number of pages	7
Journal	Nature Materials
Volume	20
Issue number	9
DOIs	https://doi.org/10.1038/s41563-021-00984-7
State	Published - Sep 2021

Funding

We gratefully acknowledge discussions with M. Lumsden, A. Tsvelik, A. Balatsky, Q. Li and X. Wang, and technical assistance from F. Loeb and M. K. Graves-Brook. This work at the Brookhaven National Laboratory (BNL) was supported by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, United States Department of Energy (US DOE), under contract no. DE-SC0012704. Work at BNL’s Center for Functional Nanomaterials was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE, under the same contract. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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title = "Electronic properties of the bulk and surface states of Fe1+yTe1−xSex",

abstract = "The idea of employing non-Abelian statistics for error-free quantum computing ignited interest in reports of topological surface superconductivity and Majorana zero modes (MZMs) in FeTe0.55Se0.45. However, the topological features and superconducting properties are not observed uniformly across the sample surface. The understanding and practical control of these electronic inhomogeneities present a prominent challenge for potential applications. Here, we combine neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe1+yTe1−xSex. We establish a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, in association with distinct antiferromagnetic correlations, whereas the coexisting topological surface state occurs only at sufficiently high Te concentration. We find that FeTe0.55Se0.45 is located very close to both phase boundaries, which explains the inhomogeneity of superconducting and topological states. Our results demonstrate the compositional control required for use of topological MZMs in practical applications.",

author = "Yangmu Li and Nader Zaki and Garlea, {Vasile O.} and Savici, {Andrei T.} and David Fobes and Zhijun Xu and Fernando Camino and Cedomir Petrovic and Genda Gu and Johnson, {Peter D.} and Tranquada, {John M.} and Zaliznyak, {Igor A.}",

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doi = "10.1038/s41563-021-00984-7",

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T1 - Electronic properties of the bulk and surface states of Fe1+yTe1−xSex

AU - Li, Yangmu

AU - Zaki, Nader

AU - Garlea, Vasile O.

AU - Savici, Andrei T.

AU - Fobes, David

AU - Xu, Zhijun

AU - Camino, Fernando

AU - Petrovic, Cedomir

AU - Gu, Genda

AU - Johnson, Peter D.

AU - Tranquada, John M.

AU - Zaliznyak, Igor A.

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N2 - The idea of employing non-Abelian statistics for error-free quantum computing ignited interest in reports of topological surface superconductivity and Majorana zero modes (MZMs) in FeTe0.55Se0.45. However, the topological features and superconducting properties are not observed uniformly across the sample surface. The understanding and practical control of these electronic inhomogeneities present a prominent challenge for potential applications. Here, we combine neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe1+yTe1−xSex. We establish a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, in association with distinct antiferromagnetic correlations, whereas the coexisting topological surface state occurs only at sufficiently high Te concentration. We find that FeTe0.55Se0.45 is located very close to both phase boundaries, which explains the inhomogeneity of superconducting and topological states. Our results demonstrate the compositional control required for use of topological MZMs in practical applications.

AB - The idea of employing non-Abelian statistics for error-free quantum computing ignited interest in reports of topological surface superconductivity and Majorana zero modes (MZMs) in FeTe0.55Se0.45. However, the topological features and superconducting properties are not observed uniformly across the sample surface. The understanding and practical control of these electronic inhomogeneities present a prominent challenge for potential applications. Here, we combine neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe1+yTe1−xSex. We establish a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, in association with distinct antiferromagnetic correlations, whereas the coexisting topological surface state occurs only at sufficiently high Te concentration. We find that FeTe0.55Se0.45 is located very close to both phase boundaries, which explains the inhomogeneity of superconducting and topological states. Our results demonstrate the compositional control required for use of topological MZMs in practical applications.

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Electronic properties of the bulk and surface states of Fe_1+yTe_1−xSe_x

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