Dirac fermions and possible weak antilocalization in LaCuSb2

J. R. Chamorro; A. Topp; Y. Fang; M. J. Winiarski; C. R. Ast; M. Krivenkov; A. Varykhalov; B. J. Ramshaw; L. M. Schoop; T. M. McQueen

doi:10.1063/1.5124685

Dirac fermions and possible weak antilocalization in LaCuSb₂

J. R. Chamorro, A. Topp, Y. Fang, M. J. Winiarski, C. R. Ast, M. Krivenkov, A. Varykhalov, B. J. Ramshaw, L. M. Schoop, T. M. McQueen

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

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

Original language	English (US)
Article number	121108
Journal	APL Materials
Volume	7
Issue number	12
DOIs	https://doi.org/10.1063/1.5124685
State	Published - Dec 1 2019

All Science Journal Classification (ASJC) codes

General Materials Science
General Engineering

Access to Document

10.1063/1.5124685

Cite this

@article{96f68bc892a54332b0a66fb2bbf98068,

title = "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.",

author = "Chamorro, {J. R.} and A. Topp and Y. Fang and Winiarski, {M. J.} and Ast, {C. R.} and M. Krivenkov and A. Varykhalov and Ramshaw, {B. J.} and Schoop, {L. M.} and McQueen, {T. M.}",

note = "Publisher Copyright: {\textcopyright} 2019 Author(s).",

year = "2019",

month = dec,

day = "1",

doi = "10.1063/1.5124685",

language = "English (US)",

volume = "7",

journal = "APL Materials",

issn = "2166-532X",

publisher = "American Institute of Physics",

number = "12",

}

TY - JOUR

T1 - Dirac fermions and possible weak antilocalization in LaCuSb2

AU - Chamorro, J. R.

AU - Topp, A.

AU - Fang, Y.

AU - Winiarski, M. J.

AU - Ast, C. R.

AU - Krivenkov, M.

AU - Varykhalov, A.

AU - Ramshaw, B. J.

AU - Schoop, L. M.

AU - McQueen, T. M.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85076710853&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85076710853&partnerID=8YFLogxK

U2 - 10.1063/1.5124685

DO - 10.1063/1.5124685

M3 - Article

AN - SCOPUS:85076710853

SN - 2166-532X

VL - 7

JO - APL Materials

JF - APL Materials

IS - 12

M1 - 121108

ER -

Dirac fermions and possible weak antilocalization in LaCuSb₂

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this