Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.126402
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Funding
- LFRIR [2010-00471]
- BSR [2009-0076700]
- SRC [2011-0030046]
- WCU [R32-2008-000-10180-0]
- MEST
- KICOS [K20602000008]
- EuroMagNET II [228043]
- NRF [2010-0006377, 2010-0020057]
- National Research Foundation of Korea [2009-00531, 2010-00471, 과06A1104, R32-2011-000-10180-0, 2010-0006377] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report the observation of highly anisotropic Dirac fermions in a Bi square net of SrMnBi2, based on a first-principles 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 similar to 8. These findings demonstrate that a Bi square net, a common building block of various layered pnictides, provides a new platform that hosts highly anisotropic Dirac fermions.
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