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

被引：30

作者：

Fang, L. ^{[1
]}

Stoumpos, C. C. ^{[2
]}

Jia, Y. ^{[3
]}

Glatz, A. ^{[2
,4
]}

Chung, D. Y. ^{[2
]}

Claus, H. ^{[2
]}

Welp, U. ^{[2
]}

Kwok, W. -K. ^{[2
]}

Kanatzidis, M. G. ^{[1
,2
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[3] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[4] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 02期

关键词：

TOPOLOGICAL INSULATOR; SURFACE-STATES; WEAK-LOCALIZATION; SPIN; BI2SE3;

D O I：

10.1103/PhysRevB.90.020504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 T-C = 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.

引用

页数：5

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