期刊
PHYSICAL REVIEW B
卷 88, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.165402
关键词
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资金
- Deutsche Forschungsgemeinschaft through Research Training School [GRK 1621]
- Deutsche Forschungsgemeinschaft through Priority Programme [SPP 1458]
The electronic structure of iron pnictides is topologically nontrivial, leading to the appearance of Dirac cones in the band structure for the antiferromagnetic phase. Motivated by the analogy with Dirac cones in graphene, we explore the possible existence of topologically protected surface states. Surprisingly, bands of surface states exist even in the paramagnetic state. A realistic five-orbital model predicts two such bands. In the antiferromagnetic phase, these surface bands survive but split. We obtain the bulk and surface dispersion from exact diagonalization of two-and five-orbital models in a strip geometry and discuss the results based on topology.
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