Dirac fermions and possible weak antilocalization in LaCuSb2

Juan Chamorro; A. Topp; Y. Fang; Michał Jerzy Winiarski; C. R. Ast; M. Krivenkov; A. Varykhalov; B. J. Ramshaw; Leslie Schoop; Tyrel McQueen

doi:10.1063/1.5124685

Dirac fermions and possible weak antilocalization in LaCuSb2

Abstract

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 0.065me, further confirming the presence of Dirac fermions in this material.

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Authors (10)

Juan Chamorro
A. Topp
Y. Fang
Michał Jerzy Winiarski (formerly: Michał Winiarski) dr inż.
C. R. Ast
M. Krivenkov
A. Varykhalov
B. J. Ramshaw
Leslie Schoop
Tyrel McQueen

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Category:: Articles
Type:: artykuły w czasopismach
Published in:: APL Materials no. 7, pages 1 - 7,
ISSN: 2166-532X
Language:: English
Publication year:: 2019
Bibliographic description:: Chamorro J., Topp A., Fang Y., Winiarski M., Ast C., Krivenkov M., Varykhalov A., Ramshaw B., Schoop L., Mcqueen T.: Dirac fermions and possible weak antilocalization in LaCuSb2// APL Materials -Vol. 7,iss. 12 (2019), s.1-7
DOI:: Digital Object Identifier (open in new tab) 10.1063/1.5124685
Verified by:: Gdańsk University of Technology