A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2

Jiang, Juan; Lee, Sangjae; Fei, Fucong; Song, Fengqi; Vescovo, Elio; Kaznatcheev, Konstantine; Walker, Frederick J.; Ahn, Charles H.

doi:10.1063/5.0011549

Title: A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir_1-xPt_xTe₂

Abstract

The transition metal dichalcogenide Ir_1-xPt_xTe₂ displays both superconductivity and a topological band structure. Using angle-resolved photoemission spectroscopy, we obtain a comprehensive understanding of the three-dimensional electronic structure in the normal state of Ir_1-xPt_xTe₂ for doping levels from x = 0.1 to 0.4, which spans the composition range of a superconducting state to a non-superconducting state. Many features of the electronic structure can be attributed to strong Te–Te interactions between the layers of the layered crystal structure and can be resolved by photon energy dependent measurements. We demonstrate that the type-II Dirac fermions can be successfully tuned via Pt doping, where the Dirac point lies close to the Fermi level for x = 0.1. The band evolution vs doping provides a clearer understanding of the relationship between the superconductivity and electronic structure. In addition, the β band in the superconducting samples locates the system close to a type-II van Hove singularity, where spin triplet paring symmetry has been predicted. Our results provide a comprehensive understanding of the band structure of Ir_1-xPt_xTe₂, and we discuss the possibilities of the existence of topological superconductivity in this system.

Authors:

^[1]; Lee, Sangjae ^[1]; Fei, Fucong ^[2];

^[2]; Vescovo, Elio ^[3]; Kaznatcheev, Konstantine ^[3]; Walker, Frederick J. ^[1]; Ahn, Charles H. ^[1]

Yale Univ., New Haven, CT (United States)
Nanjing Univ. (China)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Publication Date:: Mon Jun 01 00:00:00 EDT 2020

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

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

OSTI Identifier:: 1638802

Alternate Identifier(s):: OSTI ID: 1632232

Report Number(s):: BNL-216129-2020-JAAM
Journal ID: ISSN 2166-532X; TRN: US2202026

Grant/Contract Number:: SC0012704; SC0019211

Resource Type:: Accepted Manuscript

Journal Name:: APL Materials

Additional Journal Information:: Journal Volume: 8; Journal Issue: 6; Journal ID: ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Semimetals; Chemical compounds; Electronic bandstructure; Phase transitions; Superconductivity; Density of states; Topological phases; Angle-resolved photoemission spectroscopy

Citation Formats


                    Jiang, Juan, Lee, Sangjae, Fei, Fucong, Song, Fengqi, Vescovo, Elio, Kaznatcheev, Konstantine, Walker, Frederick J., and Ahn, Charles H. A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2.  United States: N. p., 2020. 
Web.  doi:10.1063/5.0011549.

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                    Jiang, Juan, Lee, Sangjae, Fei, Fucong, Song, Fengqi, Vescovo, Elio, Kaznatcheev, Konstantine, Walker, Frederick J., & Ahn, Charles H. A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2.  United States.  https://doi.org/10.1063/5.0011549

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                    Jiang, Juan, Lee, Sangjae, Fei, Fucong, Song, Fengqi, Vescovo, Elio, Kaznatcheev, Konstantine, Walker, Frederick J., and Ahn, Charles H. Mon .  
"A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2".  United States.  https://doi.org/10.1063/5.0011549.  https://www.osti.gov/servlets/purl/1638802.

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@article{osti_1638802,

  title        = {A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2},

  author       = {Jiang, Juan and Lee, Sangjae and Fei, Fucong and Song, Fengqi and Vescovo, Elio and Kaznatcheev, Konstantine and Walker, Frederick J. and Ahn, Charles H.},

  abstractNote = {The transition metal dichalcogenide Ir1-xPtxTe2 displays both superconductivity and a topological band structure. Using angle-resolved photoemission spectroscopy, we obtain a comprehensive understanding of the three-dimensional electronic structure in the normal state of Ir1-xPtxTe2 for doping levels from x = 0.1 to 0.4, which spans the composition range of a superconducting state to a non-superconducting state. Many features of the electronic structure can be attributed to strong Te–Te interactions between the layers of the layered crystal structure and can be resolved by photon energy dependent measurements. We demonstrate that the type-II Dirac fermions can be successfully tuned via Pt doping, where the Dirac point lies close to the Fermi level for x = 0.1. The band evolution vs doping provides a clearer understanding of the relationship between the superconductivity and electronic structure. In addition, the β band in the superconducting samples locates the system close to a type-II van Hove singularity, where spin triplet paring symmetry has been predicted. Our results provide a comprehensive understanding of the band structure of Ir1-xPtxTe2, and we discuss the possibilities of the existence of topological superconductivity in this system.},

  doi          = {10.1063/5.0011549},

  journal      = {APL Materials},

  number       = 6,

  volume       = 8,

  place        = {United States},

  year         = {Mon Jun 01 00:00:00 EDT 2020},

  month        = {Mon Jun 01 00:00:00 EDT 2020}

}

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Title: A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1-xPtxTe2

Abstract

Citation Formats

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Title: A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir_1-xPt_xTe₂

Heat capacity evidence for conventional superconductivity in the type-II Dirac semimetal ${PdTe}_{2}$
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journal, March 2018

Topological odd-parity superconductivity at type-II two-dimensional van Hove singularities
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Fermi Surface Sheet-Dependent Superconductivity in 2H-NbSe2
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Ising pairing in superconducting NbSe2 atomic layers
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Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe ₂
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Band Structure Perfection and Superconductivity in Type‐II Dirac Semimetal Ir ₁₋ _x Pt _x Te ₂
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Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe2
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