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, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

24 Citations (Scopus)

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 languageEnglish
Article number020504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number2
DOIs
Publication statusPublished - Jul 9 2014

Fingerprint

Fermions
Superconductivity
superconductivity
fermions
insulators
Electrons
Galvanomagnetic effects
Crystals
electrons
phase coherence
immunity
Backscattering
Invariance
Superconducting materials
Superconducting transition temperature
crystals
invariance
backscattering
indication
Energy gap

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2). / Fang, L.; Stoumpos, C. C.; Jia, Y.; Glatz, A.; Chung, D. Y.; Claus, H.; Welp, U.; Kwok, W. K.; Kanatzidis, Mercouri G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 2, 020504, 09.07.2014.

Research output: Contribution to journalArticle

Fang, L. ; Stoumpos, C. C. ; Jia, Y. ; Glatz, A. ; Chung, D. Y. ; Claus, H. ; Welp, U. ; Kwok, W. K. ; Kanatzidis, Mercouri G. / Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2). In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 2.
@article{ac1723b82d8043c08fd92b57dbdcaf9f,
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, {Mercouri G}",
year = "2014",
month = "7",
day = "9",
doi = "10.1103/PhysRevB.90.020504",
language = "English",
volume = "90",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "2",

}

TY - JOUR

T1 - Dirac fermions and superconductivity in the homologous structures (AgxPb1-xSe)5(Bi2Se3)3m (m=1,2)

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, Mercouri 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.

UR - http://www.scopus.com/inward/record.url?scp=84904361377&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84904361377&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.90.020504

DO - 10.1103/PhysRevB.90.020504

M3 - Article

VL - 90

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 2

M1 - 020504

ER -