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

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

Research output: Contribution to journal › Article › peer-review

109 Scopus citations

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 suppresses the bulk conductivity. Non-metallic Bi₂Se ₃ crystals are obtained. On the other hand, the Bi₂Se ₃ topological insulator can also be induced to become a bulk superconductor, with T_c∼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 in the Te content. The Bi ₂Te₃ topological insulator shows small amounts of superconductivity with T_c∼5.5 K when reacted with Pd to form materials of the type Pd_zBi₂Te₃.

Original language	English (US)
Pages (from-to)	572-576
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	72
Issue number	5
DOIs	https://doi.org/10.1016/j.jpcs.2010.10.027
State	Published - May 2011

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics

Keywords

A. Semiconductors
A. Superconductors
B. Crystal growth
D. Surface properties
D. Transport properties

Access to Document

10.1016/j.jpcs.2010.10.027

Cite this

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title = "Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3",

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 suppresses the bulk conductivity. Non-metallic Bi2Se 3 crystals are obtained. On the other hand, the Bi2Se 3 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 in the Te content. The Bi 2Te3 topological insulator shows small amounts of superconductivity with Tc∼5.5 K when reacted with Pd to form materials of the type PdzBi2Te3.",

keywords = "A. Semiconductors, A. Superconductors, B. Crystal growth, D. Surface properties, D. Transport properties",

author = "Hor, {Y. S.} and Checkelsky, {J. G.} and D. Qu and Ong, {N. P.} and Cava, {R. J.}",

note = "Funding Information: This work was supported by the NSF MRSEC program, Grant DMR-0819860 .",

year = "2011",

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doi = "10.1016/j.jpcs.2010.10.027",

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T1 - Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3

AU - Hor, Y. S.

AU - Checkelsky, J. G.

AU - Qu, D.

AU - Ong, N. P.

AU - Cava, R. J.

N1 - Funding Information: This work was supported by the NSF MRSEC program, Grant DMR-0819860 .

PY - 2011/5

Y1 - 2011/5

N2 - 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 suppresses the bulk conductivity. Non-metallic Bi2Se 3 crystals are obtained. On the other hand, the Bi2Se 3 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 in the Te content. The Bi 2Te3 topological insulator shows small amounts of superconductivity with Tc∼5.5 K when reacted with Pd to form materials of the type PdzBi2Te3.

AB - 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 suppresses the bulk conductivity. Non-metallic Bi2Se 3 crystals are obtained. On the other hand, the Bi2Se 3 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 in the Te content. The Bi 2Te3 topological insulator shows small amounts of superconductivity with Tc∼5.5 K when reacted with Pd to form materials of the type PdzBi2Te3.

KW - A. Semiconductors

KW - A. Superconductors

KW - B. Crystal growth

KW - D. Surface properties

KW - D. Transport properties

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