Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3

Y. S. Hor; J. G. Checkelsky; D. Qu; N. P. Ong; R. J. Cava

doi:10.1016/j.jpcs.2010.10.027

Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3

Strongly Correlated Electrons 2015-05-19 v1

Authors: Y. S. Hor , J. G. Checkelsky , D. Qu , N. P. Ong , R. J. Cava

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Abstract

We show that by Ca-doping the Bi2Se3 topological insulator, the Fermi level can be fine tuned to fall inside the band gap and therefore suppress the bulk conductivity. Non-metallic Bi2Se3 crystals are obtained. On the other hand, the Bi2Se3 topological insulator can also be induced to become a bulk superconductor, with Tc ~ 3.8 K, by copper intercalation in the van der Waals gaps between the Bi2Se3 layers. Likewise, an as-grown crystal of metallic Bi2Te3 can be turned into a non-metallic crystal by slight variation of the Te content. The Bi2Te3 topological insulator shows small amounts of superconductivity with Tc ~ 5.5 K when reacted with Pd to form materials of the type PdxBi2Te3.

Keywords

topological insulators Bi2Se3 Bi2Te3 superconductivity non-metallicity Ca-doping copper intercalation Fermi level tuning

Cite

@article{arxiv.1006.0317,
  title  = {Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3},
  author = {Y. S. Hor and J. G. Checkelsky and D. Qu and N. P. Ong and R. J. Cava},
  journal= {arXiv preprint arXiv:1006.0317},
  year   = {2015}
}

Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3

Abstract

Keywords

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