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      Persistence of symmetry-protected Dirac points at the surface of the topological crystalline insulator SnTe upon impurity doping.

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          Abstract

          We investigate the effect of a non-magnetic donor impurity located at the surface of the SnTe topological crystalline insulator. In particular, the changes on the surface states due to a Sb impurity atom are analyzed by means of ab initio simulations of pristine and impurity-doped SnTe. Both semi-infinite and slab geometries are considered within the first-principles approach. Furthermore, minimal and Green's function continuum models are proposed with the same goal. We find that the Dirac cones are shifted down in energy upon doping; this shift strongly depends on the position of the impurity with respect to the surface. In addition, we observe that the width of the impurity band presents an even-odd behavior by varying the position of the impurity. This behavior is related to the position of the nodes of the wave function with respect to the surface, and hence it is a manifestation of confinement effects. We compare slab and semi-infinite geometries within the ab initio approach, demonstrating that the surface states remain gapless and their spin textures are unaltered in the doped semi-infinite system. In the slab geometry, a gap opens due to hybridization of the states localized at opposite surfaces. Finally, by means of a continuum model, we extrapolate our results to arbitrary positions of the impurity, clearly showing a non-monotonic behavior of the Dirac cone.

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          Author and article information

          Journal
          Nanoscale
          Nanoscale
          Royal Society of Chemistry (RSC)
          2040-3372
          2040-3364
          May 19 2022
          : 14
          : 19
          Affiliations
          [1 ] Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, C/Sor Juana Inés de la Cruz 3, E-28049 Madrid, Spain. leochico@ucm.es.
          [2 ] GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain.
          [3 ] Departamento de Estructuras y Física de Edificación, Universidad Politécnica de Madrid, E-28040 Madrid, Spain.
          Article
          10.1039/d1nr07120c
          35380135
          deb6e79f-260e-4a3f-9453-728b39036db1
          History

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