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Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2

Title: Nearly Massless Dirac Fermions Hosted By Sb Square Net In Bamnsb2.
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Name(s): Liu, Jinyu, author
Hu, Jin, author
Cao, Huibo, author
Zhu, Yanglin, author
Chuang, Alyssa, author
Graf, D., author
Adams, D. J., author
Radmanesh, S. M. A., author
Spinu, L., author
Chiorescu, I., author
Mao, Zhiqiang, author
Type of Resource: text
Genre: Text
Date Issued: 2016-07-28
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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 BaMnSb2 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 (similar to 0.052m(0); m(0), mass of free electron), high quantum mobility (1280 cm(2)V(-1)S(-1)) and a pi Berry phase accumulated along cyclotron orbit. Compared with AMnBi(2), BaMnSb2 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 similar to 670. Additionally, BaMnSb2 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 BaMnSb2 an intriguing platform for seeking novel exotic phenomena of massless Dirac electrons.
Identifier: FSU_libsubv1_wos_000380964100001 (IID), 10.1038/srep30525 (DOI)
Keywords: arcs, camnbi2, crystal-structure, discovery, node, phase, resolved photoemission-spectroscopy, semimetal cd3as2, srmnbi2, taas
Publication Note: The publisher’s version of record is available at https://doi.org/10.1038/srep30525
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000380964100001
Owner Institution: FSU
Is Part Of: Scientific Reports.
2045-2322
Issue: vol. 6

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Liu, J., Hu, J., Cao, H., Zhu, Y., Chuang, A., Graf, D., … Mao, Z. (2016). Nearly Massless Dirac Fermions Hosted By Sb Square Net In Bamnsb2. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000380964100001