Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2)

L. Fang; C. C. Stoumpos; Y. Jia; A. Glatz; D. Y. Chung; H. Claus; U. Welp; W. K. Kwok; M. G. Kanatzidis

doi:10.1103/PhysRevB.90.020504

Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2)

L. Fang, C. C. Stoumpos, Y. Jia, A. Glatz, D. Y. Chung, H. Claus, U. Welp, W. K. Kwok, M. G. Kanatzidis

Chemistry

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28 Scopus citations

Abstract

A newly discovered topological insulator (TI) (AgxPb1-xSe)5(Bi2Se3)3m (m=2) has a band gap of 0.5 eV, the largest value reported in topological insulators. We present a magnetotransport study of the Dirac electrons of this compound in the quantum diffusion regime. Two-dimensional weak antilocalization due to the destructive interference of the Dirac electrons was observed. The phase coherence length of the Dirac electrons is independent of doping and disorder levels. This provides an indication of the backscattering immunity under the protection of time reversal invariance of the TI. We further report that the homologous compound (AgxPb1-xSe)5(Bi2Se3)3m (m=1) is a superconductor with a transition temperature TC=1.7 K. The related structures of these two phases allow lateral intergrowth of crystals to occur naturally, offering a potential platform to observe the Majorana fermion state at the boundary of two intergrown crystals.

Original language	English (US)
Article number	020504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.90.020504
State	Published - Jul 9 2014

Funding

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.90.020504

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title = "Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2)",

abstract = "A newly discovered topological insulator (TI) (AgxPb1-xSe)5(Bi2Se3)3m (m=2) has a band gap of 0.5 eV, the largest value reported in topological insulators. We present a magnetotransport study of the Dirac electrons of this compound in the quantum diffusion regime. Two-dimensional weak antilocalization due to the destructive interference of the Dirac electrons was observed. The phase coherence length of the Dirac electrons is independent of doping and disorder levels. This provides an indication of the backscattering immunity under the protection of time reversal invariance of the TI. We further report that the homologous compound (AgxPb1-xSe)5(Bi2Se3)3m (m=1) is a superconductor with a transition temperature TC=1.7 K. The related structures of these two phases allow lateral intergrowth of crystals to occur naturally, offering a potential platform to observe the Majorana fermion state at the boundary of two intergrown crystals.",

author = "L. Fang and Stoumpos, {C. C.} and Y. Jia and A. Glatz and Chung, {D. Y.} and H. Claus and U. Welp and Kwok, {W. K.} and Kanatzidis, {M. G.}",

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AU - Fang, L.

AU - Stoumpos, C. C.

AU - Jia, Y.

AU - Glatz, A.

AU - Chung, D. Y.

AU - Claus, H.

AU - Welp, U.

AU - Kwok, W. K.

AU - Kanatzidis, M. G.

PY - 2014/7/9

Y1 - 2014/7/9

N2 - A newly discovered topological insulator (TI) (AgxPb1-xSe)5(Bi2Se3)3m (m=2) has a band gap of 0.5 eV, the largest value reported in topological insulators. We present a magnetotransport study of the Dirac electrons of this compound in the quantum diffusion regime. Two-dimensional weak antilocalization due to the destructive interference of the Dirac electrons was observed. The phase coherence length of the Dirac electrons is independent of doping and disorder levels. This provides an indication of the backscattering immunity under the protection of time reversal invariance of the TI. We further report that the homologous compound (AgxPb1-xSe)5(Bi2Se3)3m (m=1) is a superconductor with a transition temperature TC=1.7 K. The related structures of these two phases allow lateral intergrowth of crystals to occur naturally, offering a potential platform to observe the Majorana fermion state at the boundary of two intergrown crystals.

AB - A newly discovered topological insulator (TI) (AgxPb1-xSe)5(Bi2Se3)3m (m=2) has a band gap of 0.5 eV, the largest value reported in topological insulators. We present a magnetotransport study of the Dirac electrons of this compound in the quantum diffusion regime. Two-dimensional weak antilocalization due to the destructive interference of the Dirac electrons was observed. The phase coherence length of the Dirac electrons is independent of doping and disorder levels. This provides an indication of the backscattering immunity under the protection of time reversal invariance of the TI. We further report that the homologous compound (AgxPb1-xSe)5(Bi2Se3)3m (m=1) is a superconductor with a transition temperature TC=1.7 K. The related structures of these two phases allow lateral intergrowth of crystals to occur naturally, offering a potential platform to observe the Majorana fermion state at the boundary of two intergrown crystals.

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Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2)

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