Crystal growth and transport properties of Weyl semimetal TaAs

Raman Sankar; G. Peramaiyan; I. Panneer Muthuselvam; Suyang Xu; M. Zahid Hasan; F. C. Chou

doi:10.1088/1361-648X/aa9a75

Crystal growth and transport properties of Weyl semimetal TaAs

Raman Sankar, G. Peramaiyan, I. Panneer Muthuselvam, Suyang Xu, M. Zahid Hasan, F. C. Chou

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

12 Scopus citations

Abstract

We report the single crystal growth and transport properties of a Weyl semimetal TaAs. Unsaturated large magnetoresistance of about 22 100% at 2 K and 9 T is observed. From the Hall measurement, carrier concentrations n = 4.608 × 10²⁴ m^-3 and p = 3.099 × 10²⁴ m^-3, and mobilities mg _p = 2.502 m² V^-1 s^-1 and μ _n = 16.785 m² V^-1 s^-1 at 2 K are extracted. The de Haas-van Alphen oscillations at 2 K and 9 T suggest the presence of a Fermi surface, and the quantum electronic parameters such as effective cyclotron mass and Dingle temperature were obtained using Lifshitz-Kosevich fitting. Temperature dependent resistivity measurements at different static magnetic fields suggest the formation of an insulating gap in the Weyl semimetal TaAs. An angle-resolved photoemission spectroscopy study reveals Fermi arc surface states with different shaped features such as a long elliptical contour around each point, a bowtie-shaped contour around each point, and a crescent-shaped feature near the midpoint of each line.

Original language	English (US)
Article number	015803
Journal	Journal of Physics Condensed Matter
Volume	30
Issue number	1
DOIs	https://doi.org/10.1088/1361-648X/aa9a75
State	Published - Jan 10 2018

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Materials Science(all)

Keywords

Weyl semimetal
field induced semiconducting behavior
quantum oscillation

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10.1088/1361-648X/aa9a75

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title = "Crystal growth and transport properties of Weyl semimetal TaAs",

abstract = "We report the single crystal growth and transport properties of a Weyl semimetal TaAs. Unsaturated large magnetoresistance of about 22 100% at 2 K and 9 T is observed. From the Hall measurement, carrier concentrations n = 4.608 × 1024 m-3 and p = 3.099 × 1024 m-3, and mobilities mg p = 2.502 m2 V-1 s-1 and μ n = 16.785 m2 V-1 s-1 at 2 K are extracted. The de Haas-van Alphen oscillations at 2 K and 9 T suggest the presence of a Fermi surface, and the quantum electronic parameters such as effective cyclotron mass and Dingle temperature were obtained using Lifshitz-Kosevich fitting. Temperature dependent resistivity measurements at different static magnetic fields suggest the formation of an insulating gap in the Weyl semimetal TaAs. An angle-resolved photoemission spectroscopy study reveals Fermi arc surface states with different shaped features such as a long elliptical contour around each point, a bowtie-shaped contour around each point, and a crescent-shaped feature near the midpoint of each line.",

keywords = "Weyl semimetal, field induced semiconducting behavior, quantum oscillation",

author = "Raman Sankar and G. Peramaiyan and Muthuselvam, {I. Panneer} and Suyang Xu and Hasan, {M. Zahid} and Chou, {F. C.}",

note = "Funding Information: RS and FCC acknowledge the support provided by the Academia Sinica research program on Nanoscience and Nanotechnology under project number NM004 and Nanoscience and Nanotechnology Thematic Program of Academia Sinica. FCC acknowledges support from the Ministry of Science and Technology in Taiwan under project number MOST-102-2119-M-002-004. IPM thanks the Department of Science Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",

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AU - Sankar, Raman

AU - Peramaiyan, G.

AU - Muthuselvam, I. Panneer

AU - Xu, Suyang

AU - Hasan, M. Zahid

AU - Chou, F. C.

N1 - Funding Information: RS and FCC acknowledge the support provided by the Academia Sinica research program on Nanoscience and Nanotechnology under project number NM004 and Nanoscience and Nanotechnology Thematic Program of Academia Sinica. FCC acknowledges support from the Ministry of Science and Technology in Taiwan under project number MOST-102-2119-M-002-004. IPM thanks the Department of Science Publisher Copyright: © 2017 IOP Publishing Ltd.

PY - 2018/1/10

Y1 - 2018/1/10

N2 - We report the single crystal growth and transport properties of a Weyl semimetal TaAs. Unsaturated large magnetoresistance of about 22 100% at 2 K and 9 T is observed. From the Hall measurement, carrier concentrations n = 4.608 × 1024 m-3 and p = 3.099 × 1024 m-3, and mobilities mg p = 2.502 m2 V-1 s-1 and μ n = 16.785 m2 V-1 s-1 at 2 K are extracted. The de Haas-van Alphen oscillations at 2 K and 9 T suggest the presence of a Fermi surface, and the quantum electronic parameters such as effective cyclotron mass and Dingle temperature were obtained using Lifshitz-Kosevich fitting. Temperature dependent resistivity measurements at different static magnetic fields suggest the formation of an insulating gap in the Weyl semimetal TaAs. An angle-resolved photoemission spectroscopy study reveals Fermi arc surface states with different shaped features such as a long elliptical contour around each point, a bowtie-shaped contour around each point, and a crescent-shaped feature near the midpoint of each line.

AB - We report the single crystal growth and transport properties of a Weyl semimetal TaAs. Unsaturated large magnetoresistance of about 22 100% at 2 K and 9 T is observed. From the Hall measurement, carrier concentrations n = 4.608 × 1024 m-3 and p = 3.099 × 1024 m-3, and mobilities mg p = 2.502 m2 V-1 s-1 and μ n = 16.785 m2 V-1 s-1 at 2 K are extracted. The de Haas-van Alphen oscillations at 2 K and 9 T suggest the presence of a Fermi surface, and the quantum electronic parameters such as effective cyclotron mass and Dingle temperature were obtained using Lifshitz-Kosevich fitting. Temperature dependent resistivity measurements at different static magnetic fields suggest the formation of an insulating gap in the Weyl semimetal TaAs. An angle-resolved photoemission spectroscopy study reveals Fermi arc surface states with different shaped features such as a long elliptical contour around each point, a bowtie-shaped contour around each point, and a crescent-shaped feature near the midpoint of each line.

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KW - field induced semiconducting behavior

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Crystal growth and transport properties of Weyl semimetal TaAs

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