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Two-dimensional Dirac fermions in YbMnBi2 antiferromagnet

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arxiv 1604.01009 v1 pith:GZ47NZFG submitted 2016-04-04 cond-mat.mes-hall cond-mat.mtrl-scicond-mat.str-el

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
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Yimei Zhu C. Petrovic
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classification cond-mat.mes-hall cond-mat.mtrl-scicond-mat.str-el
keywords diracfermionsybmnbi2berryphasepresencequantumtwo-dimensional
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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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