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      Strain-tuning of Dirac states at the SnTe (001) surface

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      ScienceOpen Posters
      ScienceOpen
      79th Annual Meeting of the DPG and DPG Spring Meeting 2015
      Topological Insulators, surface states, topology, Dirac cones, symmetry, Topological crystalline insulator, SnTe
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            Abstract

            The topological crystalline insulator SnTe belongs to the recently discovered class of materials in which a crystalline symmetry ensures the existence of topologically protected Dirac like surface states. In contrast to topological insulators, this symmetry can be broken via deformations of the crystal. This opens up new possibilities of manipulating the Dirac states and inducing a controllable gap. Here, we have employed density-functional theory to investigate the response of the Dirac states to lattice deformations [1]. The (001) surface exhibits four Dirac cones which lie at non-time-reversal-invariant points close to X, along the projection of the (110) and (110) mirror planes. Our calculations show that a gap of up to approx 30 meV can be introduced via lattice deformations that break at least one of these mirror symmetries. Remarkably, distortions at the surface only can already open up the gap, even though bulk properties are not changed. The gap is formed at either all four or just two cones, depending on the direction of the displacement vector, making it possible to create a state where gaped and non-gaped Dirac cones coexist. Notably, if the whole slab is distorted, bulk bands are being pushed into the gap making the whole system metallic. [1] M. Drüppel et al, Phys. Rev. B 90, 155312 (2014)

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            Author and article information

            Conference
            ScienceOpen Posters
            ScienceOpen
            March 27 2015
            Author information
            https://orcid.org/0000-0002-6375-7743
            Article
            10.14293/P2199-8442.1.SOP-PHYS.PL6CZ9.v1
            d0856187-4b72-4e21-835e-d7f3ea4f8596

            This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com .

            79th Annual Meeting of the DPG and DPG Spring Meeting 2015
            History

            Condensed matter,Solid state physics,Physics
            Topological Insulators, surface states, topology, Dirac cones, symmetry, Topological crystalline insulator, SnTe

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