Dirac fermions and possible weak antilocalization in LaCuSb2

被引：24

作者：

Chamorro, J. R. ^{[1
,2
]}

Topp, A. ^{[3
,4
]}

Fang, Y. ^{[5
]}

Winiarski, M. J. ^{[1
,2
,6
]}

Ast, C. R. ^{[3
]}

Krivenkov, M. ^{[7
]}

Varykhalov, A. ^{[7
]}

Ramshaw, B. J. ^{[5
]}

Schoop, L. M. ^{[3
,4
]}

McQueen, T. M. ^{[1
,2
,8
]}

机构：

[1] Johns Hopkins Univ, Dept Chem, Baltimore, MD 21218 USA

[2] Johns Hopkins Univ, Dept Phys & Astron, Inst Quantum Matter, Baltimore, MD 21218 USA

[3] Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany

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

[5] Cornell Univ, Lab Atom & Solid State Phys, Ithaca, NY 14853 USA

[6] Gdansk Univ Technol, Fac Appl Phys & Math, Ul Narutowicza 11-12, PL-80233 Gdansk, Poland

[7] Elektronenspeicherring BESSY II, Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany

[8] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

来源：

APL MATERIALS | 2019年 / 7卷 / 12期

基金：

美国国家科学基金会;

关键词：

SEMIMETAL; MAGNETORESISTANCE; MOBILITY; NI; CE; CU; PD;

D O I：

10.1063/1.5124685

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb2. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy, along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically nontrivial effects. Measurements of the Shubnikov-de Haas quantum oscillations show low effective mass electrons on the order of 0.065m(e), further confirming the presence of Dirac fermions in this material.

引用

页数：7

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