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

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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

Materials Science(all)
Engineering(all)

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10.1063/1.5124685

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@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 = "Funding Information: This work was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0019331. L.M.S. was supported by NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center (Grant No. DMR-1420541), and by a MURI grant on Topological Insulators from the Army Research Office (Grant No. ARO W911NF-12-1-0461). A.T. was supported by the DFG (Proposal No. SCHO 1730/1-1). Y.F. and B.J.R. are supported by the National Science Foundation under Grant No. 1752784. We thank HZB for the allocation of synchrotron radiation beamtime. Publisher Copyright: {\textcopyright} 2019 Author(s).",

year = "2019",

month = dec,

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doi = "10.1063/1.5124685",

language = "English (US)",

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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.

N1 - Funding Information: This work was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0019331. L.M.S. was supported by NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center (Grant No. DMR-1420541), and by a MURI grant on Topological Insulators from the Army Research Office (Grant No. ARO W911NF-12-1-0461). A.T. was supported by the DFG (Proposal No. SCHO 1730/1-1). Y.F. and B.J.R. are supported by the National Science Foundation under Grant No. 1752784. We thank HZB for the allocation of synchrotron radiation beamtime. Publisher Copyright: © 2019 Author(s).

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.

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Dirac fermions and possible weak antilocalization in LaCuSb₂

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