Anisotropic Dirac fermions in a Bi square net of SrMnBi2

Autor:	Park, Joonbum, Lee, G., Wolff-Fabris, F., Koh, Y. Y., Eom, M. J., Kim, Y. K., Farhan, M. A., Jo, Y. J., Kim, C., Shim, J. H., Kim, J. S.
Rok vydání:	2011
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.107.126402
Popis:	We report the highly anisotropic Dirac fermions in a Bi square net of SrMnBi2, based on a first principle calculation, angle resolved photoemission spectroscopy, and quantum oscillations for high-quality single crystals. We found that the Dirac dispersion is generally induced in the (SrBi)+ layer containing a double-sized Bi square net. In contrast to the commonly observed isotropic Dirac cone, the Dirac cone in SrMnBi2 is highly anisotropic with a large momentum-dependent disparity of Fermi velocities of ~ 8. These findings demonstrate that a Bi square net, a common building block of various layered pnictides, provide a new platform that hosts highly anisotropic Dirac fermions. Comment: 5 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1104.5138 Zobrazit plný text záznamu View this record from Arxiv