Nearly massless Dirac fermions hosted by Sb square net in BaMnSb 2

Jinyu Liu, Jin Hu, Huibo Cao, Yanglin Zhu, Alyssa Chuang, D. Graf, D. J. Adams, S. M.A. Radmanesh, L. Spinu, I. Chiorescu, Zhiqiang Mao

Research output: Contribution to journalArticle

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Abstract

Layered compounds AMnBi 2 (A = Ca, Sr, Ba, or rare earth element) have been established as Dirac materials. Dirac electrons generated by the two-dimensional (2D) Bi square net in these materials are normally massive due to the presence of a spin-orbital coupling (SOC) induced gap at Dirac nodes. Here we report that the Sb square net in an isostructural compound BaMnSb 2 can host nearly massless Dirac fermions. We observed strong Shubnikov-de Haas (SdH) oscillations in this material. From the analyses of the SdH oscillations, we find key signatures of Dirac fermions, including light effective mass (∼0.052m 0; m 0, mass of free electron), high quantum mobility (1280 cm 2 V â 1 S â 1) and a I € Berry phase accumulated along cyclotron orbit. Compared with AMnBi 2, BaMnSb 2 also exhibits much more significant quasi two-dimensional (2D) electronic structure, with the out-of-plane transport showing nonmetallic conduction below 120 K and the ratio of the out-of-plane and in-plane resistivity reaching ∼670. Additionally, BaMnSb 2 also exhibits a G-Type antiferromagnetic order below 283 K. The combination of nearly massless Dirac fermions on quasi-2D planes with a magnetic order makes BaMnSb 2 an intriguing platform for seeking novel exotic phenomena of massless Dirac electrons.

Original languageEnglish (US)
Article number30525
JournalScientific reports
Volume6
DOIs
StatePublished - Jul 28 2016

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fermions
oscillations
free electrons
cyclotrons
electrons
rare earth elements
platforms
signatures
electronic structure
orbits
conduction
orbitals
electrical resistivity

All Science Journal Classification (ASJC) codes

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Liu, Jinyu ; Hu, Jin ; Cao, Huibo ; Zhu, Yanglin ; Chuang, Alyssa ; Graf, D. ; Adams, D. J. ; Radmanesh, S. M.A. ; Spinu, L. ; Chiorescu, I. ; Mao, Zhiqiang. / Nearly massless Dirac fermions hosted by Sb square net in BaMnSb 2. In: Scientific reports. 2016 ; Vol. 6.
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abstract = "Layered compounds AMnBi 2 (A = Ca, Sr, Ba, or rare earth element) have been established as Dirac materials. Dirac electrons generated by the two-dimensional (2D) Bi square net in these materials are normally massive due to the presence of a spin-orbital coupling (SOC) induced gap at Dirac nodes. Here we report that the Sb square net in an isostructural compound BaMnSb 2 can host nearly massless Dirac fermions. We observed strong Shubnikov-de Haas (SdH) oscillations in this material. From the analyses of the SdH oscillations, we find key signatures of Dirac fermions, including light effective mass (∼0.052m 0; m 0, mass of free electron), high quantum mobility (1280 cm 2 V {\^a} 1 S {\^a} 1) and a I € Berry phase accumulated along cyclotron orbit. Compared with AMnBi 2, BaMnSb 2 also exhibits much more significant quasi two-dimensional (2D) electronic structure, with the out-of-plane transport showing nonmetallic conduction below 120 K and the ratio of the out-of-plane and in-plane resistivity reaching ∼670. Additionally, BaMnSb 2 also exhibits a G-Type antiferromagnetic order below 283 K. The combination of nearly massless Dirac fermions on quasi-2D planes with a magnetic order makes BaMnSb 2 an intriguing platform for seeking novel exotic phenomena of massless Dirac electrons.",
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Liu, J, Hu, J, Cao, H, Zhu, Y, Chuang, A, Graf, D, Adams, DJ, Radmanesh, SMA, Spinu, L, Chiorescu, I & Mao, Z 2016, 'Nearly massless Dirac fermions hosted by Sb square net in BaMnSb 2', Scientific reports, vol. 6, 30525. https://doi.org/10.1038/srep30525

Nearly massless Dirac fermions hosted by Sb square net in BaMnSb 2. / Liu, Jinyu; Hu, Jin; Cao, Huibo; Zhu, Yanglin; Chuang, Alyssa; Graf, D.; Adams, D. J.; Radmanesh, S. M.A.; Spinu, L.; Chiorescu, I.; Mao, Zhiqiang.

In: Scientific reports, Vol. 6, 30525, 28.07.2016.

Research output: Contribution to journalArticle

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AU - Liu, Jinyu

AU - Hu, Jin

AU - Cao, Huibo

AU - Zhu, Yanglin

AU - Chuang, Alyssa

AU - Graf, D.

AU - Adams, D. J.

AU - Radmanesh, S. M.A.

AU - Spinu, L.

AU - Chiorescu, I.

AU - Mao, Zhiqiang

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