Two-dimensional Dirac fermions in YbMnBi2 antiferromagnet
Aifeng Wang, I. Zaliznyak, Weijun Ren, Lijun Wu, D. Graf, V. O., Garlea, J. B. Warren, E. Bozin, Yimei Zhu, C. Petrovic
TL;DR
This paper reports the discovery of two-dimensional Dirac fermions in YbMnBi2, a layered antiferromagnetic material, through quantum transport measurements revealing nontrivial Berry phase and anisotropic conductivity.
Contribution
It provides experimental evidence of 2D Dirac fermions in YbMnBi2 and links magnetic order with quantum transport properties in this layered compound.
Findings
Presence of quasi-2D Dirac fermions confirmed by Berry phase.
Observation of quantum oscillations indicating electron and hole Fermi surface parts.
Anisotropic conductivity and magnetic order below 290 K.
Abstract
We report two-dimensional quantum transport and Dirac fermions in YbMnBi2 single crystals. YbMnBi2 is a layered material with anisotropic conductivity and magnetic order below 290 K. Magnetotransport properties, nonzero Berry phase and small cyclotron mass indicate the presence of quasi two dimensional Dirac fermions. Quantum oscillations in Hall resistivity suggest the presence of both electron and hole parts of the Fermi surface whereas the Berry phase suggests spin-orbit coupling.
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Taxonomy
TopicsRare-earth and actinide compounds · Physics of Superconductivity and Magnetism · Iron-based superconductors research