Orbital selective spin-texture in a topological insulator

Singh, Bahadur; Prasad, R.

doi:10.1063/1.4915467

Title: Orbital selective spin-texture in a topological insulator

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Abstract

Three-dimensional topological insulators support a metallic non-trivial surface state with unique spin texture, where spin and momentum are locked perpendicular to each other. In this work, we investigate the orbital selective spin-texture associated with the topological surface states in Sb2Te{sub 3}, using the first principles calculations. Sb2Te{sub 3} is a strong topological insulator with a p-p type bulk band inversion at the Γ-point and supports a single topological metallic surface state with upper (lower) Dirac-cone has left (right) handed spin-texture. Here, we show that the topological surface state has an additional locking between the spin and orbitals, leading to an orbital selective spin-texture. The out-of-plane orbitals (p{sub z} orbitals) have an isotropic orbital texture for both the Dirac cones with an associated left and right handed spin-texture for the upper and lower Dirac cones, respectively. In contrast, the in-planar orbital texture (p{sub x} and p{sub y} projections) is tangential for the upper Dirac-cone and is radial for the lower Dirac-cone surface state. The dominant in-planar orbital texture in both the Dirac cones lead to a right handed orbital-selective spin-texture.

Authors:

Singh, Bahadur; Prasad, R. ^[1]

Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (India)

Publication Date:: Fri May 15 00:00:00 EDT 2015

OSTI Identifier:: 22391775

Resource Type:: Journal Article

Journal Name:: AIP Conference Proceedings

Additional Journal Information:: Journal Volume: 1661; Journal Issue: 1; Conference: ICCMP 2014: International Conference on Condensed Matter Physics 2014, Shimla (India), 4-6 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIMONY TELLURIDES; CONES; DIELECTRIC MATERIALS; L-S COUPLING; SPIN; SURFACES; TEXTURE; THREE-DIMENSIONAL CALCULATIONS; TOPOLOGY

Citation Formats


                    Singh, Bahadur, and Prasad, R. Orbital selective spin-texture in a topological insulator.  United States: N. p., 2015. 
        Web.  doi:10.1063/1.4915467.

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                    Singh, Bahadur, & Prasad, R. Orbital selective spin-texture in a topological insulator.  United States.  https://doi.org/10.1063/1.4915467

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                    Singh, Bahadur, and Prasad, R. 2015.  
        "Orbital selective spin-texture in a topological insulator".  United States.  https://doi.org/10.1063/1.4915467.

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@article{osti_22391775,

  title        = {Orbital selective spin-texture in a topological insulator},

  author       = {Singh, Bahadur and Prasad, R.},

  abstractNote = {Three-dimensional topological insulators support a metallic non-trivial surface state with unique spin texture, where spin and momentum are locked perpendicular to each other. In this work, we investigate the orbital selective spin-texture associated with the topological surface states in Sb2Te{sub 3}, using the first principles calculations. Sb2Te{sub 3} is a strong topological insulator with a p-p type bulk band inversion at the Γ-point and supports a single topological metallic surface state with upper (lower) Dirac-cone has left (right) handed spin-texture. Here, we show that the topological surface state has an additional locking between the spin and orbitals, leading to an orbital selective spin-texture. The out-of-plane orbitals (p{sub z} orbitals) have an isotropic orbital texture for both the Dirac cones with an associated left and right handed spin-texture for the upper and lower Dirac cones, respectively. In contrast, the in-planar orbital texture (p{sub x} and p{sub y} projections) is tangential for the upper Dirac-cone and is radial for the lower Dirac-cone surface state. The dominant in-planar orbital texture in both the Dirac cones lead to a right handed orbital-selective spin-texture.},

  doi          = {10.1063/1.4915467},

  url          = {https://www.osti.gov/biblio/22391775},
  journal      = {AIP Conference Proceedings},

  issn         = {0094-243X},

  number       = 1,

  volume       = 1661,

  place        = {United States},

  year         = {Fri May 15 00:00:00 EDT 2015},

  month        = {Fri May 15 00:00:00 EDT 2015}

}

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