Dirac metal to topological metal transition at a structural phase change in Au2Pb and prediction of Z2 topology for the superconductor

被引：53

作者：

Schoop, Leslie M. ^{[1
]}

Xie, Lilia S. ^{[1
]}

Chen, Ru ^{[2
,3
]}

Gibson, Quinn D. ^{[1
]}

Lapidus, Saul H. ^{[4
]}

Kimchi, Itamar ^{[3
]}

Hirschberger, Max ^{[5
]}

Haldolaarachchige, Neel ^{[1
]}

Ali, Mazhar N. ^{[1
]}

Belvin, Carina A. ^{[6
,7
]}

Liang, Tian ^{[5
]}

Neaton, Jeffrey B. ^{[2
,3
,8
]}

Ong, N. P. ^{[5
]}

Vishwanath, Ashvin ^{[3
]}

Cava, R. J. ^{[1
]}

机构：

[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

[5] Princeton Univ, Dept Phys, Joseph Henry Lab, Princeton, NJ 08544 USA

[6] Wellesley Coll, Wellesley, MA 02481 USA

[7] PCCM, Res Experience Undergrad Program, Princeton, NJ 08544 USA

[8] Kavli Energy Nanosci Inst, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 21期

基金：

美国国家科学基金会;

关键词：

SEMIMETAL; TEMPERATURE; MOBILITY; SPIN;

D O I：

10.1103/PhysRevB.91.214517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three-dimensionalDirac semimetals (DSMs) arematerials that have masslessDirac electrons and exhibit exotic physical properties. It has been suggested that structurally distorting a DSM can create a topological insulator but this has not yet been experimentally verified. Furthermore, Majorana fermions have been theoretically proposed to exist inmaterials that exhibit both superconductivity and topological surface states. Herewe showthat the cubic Laves phase Au2Pb has a bulk Dirac cone that is predicted to gap on cooling through a structural phase transition at 100 K. The low temperature phase can be assigned a Z(2) = -1 topological index, and this phase becomes superconducting below 1.2 K. These characteristics make Au2Pb a unique platform for studying the transition between bulk Dirac electrons and topological surface states as well as studying the interaction of superconductivity with topological surface states, combining many different properties of emergent materials-superconductivity, bulk Dirac electrons, and a topologically nontrivial Z(2) invariant.

引用

页数：6

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