Nonlocal signatures of the chiral magnetic effect in the Dirac semimetal Bi0.97Sb0.03

Jorrit C. De Boer (Corresponding Author), Daan H. Wielens (Corresponding Author), Joris A. Voerman, Bob De Ronde, Yingkai Huang, Mark S. Golden, Chuan Li, Alexander Brinkman

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Abstract

The field of topological materials science has recently been focusing on three-dimensional Dirac semimetals, which exhibit robust Dirac phases in the bulk. However, the absence of characteristic surface states in accidental Dirac semimetals (DSMs) makes it difficult to experimentally verify claims about the topological nature using commonly used surface-sensitive techniques. The chiral magnetic effect (CME), which originates from the Weyl nodes, causes an E·B-dependent chiral charge polarization, which manifests itself as negative magnetoresistance. We exploit the extended lifetime of the chirally polarized charge and study the CME through both local and nonlocal measurements in Hall bar structures fabricated from single crystalline flakes of the DSM Bi0.97Sb0.03. From the nonlocal measurement results we find a chiral charge relaxation time, which is over one order of magnitude larger than the Drude transport lifetime, underlining the topological nature of Bi0.97Sb0.03.

Original languageEnglish
Article number085124
JournalPhysical Review B
Volume99
Issue number8
DOIs
Publication statusPublished - 13 Feb 2019

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Metalloids
magnetic effects
metalloids
signatures
life (durability)
flakes
Surface states
Magnetoresistance
Materials science
materials science
Relaxation time
relaxation time
Polarization
Crystalline materials
causes
polarization

Cite this

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title = "Nonlocal signatures of the chiral magnetic effect in the Dirac semimetal Bi0.97Sb0.03",
abstract = "The field of topological materials science has recently been focusing on three-dimensional Dirac semimetals, which exhibit robust Dirac phases in the bulk. However, the absence of characteristic surface states in accidental Dirac semimetals (DSMs) makes it difficult to experimentally verify claims about the topological nature using commonly used surface-sensitive techniques. The chiral magnetic effect (CME), which originates from the Weyl nodes, causes an E·B-dependent chiral charge polarization, which manifests itself as negative magnetoresistance. We exploit the extended lifetime of the chirally polarized charge and study the CME through both local and nonlocal measurements in Hall bar structures fabricated from single crystalline flakes of the DSM Bi0.97Sb0.03. From the nonlocal measurement results we find a chiral charge relaxation time, which is over one order of magnitude larger than the Drude transport lifetime, underlining the topological nature of Bi0.97Sb0.03.",
author = "{De Boer}, {Jorrit C.} and Wielens, {Daan H.} and Voerman, {Joris A.} and {De Ronde}, Bob and Yingkai Huang and Golden, {Mark S.} and Chuan Li and Alexander Brinkman",
year = "2019",
month = "2",
day = "13",
doi = "10.1103/PhysRevB.99.085124",
language = "English",
volume = "99",
journal = "Physical review B: Covering condensed matter and materials physics",
issn = "2469-9950",
publisher = "American Institute of Physics",
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}

Nonlocal signatures of the chiral magnetic effect in the Dirac semimetal Bi0.97Sb0.03. / De Boer, Jorrit C. (Corresponding Author); Wielens, Daan H. (Corresponding Author); Voerman, Joris A.; De Ronde, Bob; Huang, Yingkai; Golden, Mark S.; Li, Chuan; Brinkman, Alexander.

In: Physical Review B, Vol. 99, No. 8, 085124, 13.02.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Nonlocal signatures of the chiral magnetic effect in the Dirac semimetal Bi0.97Sb0.03

AU - De Boer, Jorrit C.

AU - Wielens, Daan H.

AU - Voerman, Joris A.

AU - De Ronde, Bob

AU - Huang, Yingkai

AU - Golden, Mark S.

AU - Li, Chuan

AU - Brinkman, Alexander

PY - 2019/2/13

Y1 - 2019/2/13

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AB - The field of topological materials science has recently been focusing on three-dimensional Dirac semimetals, which exhibit robust Dirac phases in the bulk. However, the absence of characteristic surface states in accidental Dirac semimetals (DSMs) makes it difficult to experimentally verify claims about the topological nature using commonly used surface-sensitive techniques. The chiral magnetic effect (CME), which originates from the Weyl nodes, causes an E·B-dependent chiral charge polarization, which manifests itself as negative magnetoresistance. We exploit the extended lifetime of the chirally polarized charge and study the CME through both local and nonlocal measurements in Hall bar structures fabricated from single crystalline flakes of the DSM Bi0.97Sb0.03. From the nonlocal measurement results we find a chiral charge relaxation time, which is over one order of magnitude larger than the Drude transport lifetime, underlining the topological nature of Bi0.97Sb0.03.

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