Detailed band structure of twinned and detwinned BaFe${}_2$As${}_2$ studied with angle-resolved photoemission spectroscopy

Abstract

We study the band structure of twinned and detwinned BaFe${}_2$As${}_2$ using angle-resolved photoemission spectroscopy (ARPES). The combination of measurements in the ordered and normal state along four high-symmetry momentum directions $\Gamma$/Z--X/Y enables us to identify the complex reconstructed band structure in the ordered state in great detail. We clearly observe the nematic splitting of the $d_{xz}$ and $d_{yz}$ orbitals as well as folding due to magnetic order with a wave vector of $(\pi ,\pi ,\pi )$. We are able to assign all observed bands. In particular we suggest an assignment of the electron bands different from previous reports. The high quality spectra allow us to achieve a comprehensive understanding of the band structure of BaFe${}_2$As${}_2$.

9 pages, 7 figures

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• Observation of Two Cascading Screening Processes in an Iron-based Superconductor
• Observation of the bands with $d_{xy}$ orbital character near the Fermi level in NdFeAs${}_{1-x}$P${}_x$O${}_{0.9}$F${}_{0.1}$ using angle-resolved photoemission spectroscopy
• Observation of the Dirac Dispersions in Co-doped CaFe2As2
• In-plane anisotropic magnetoresistance in detwinned $BaF{e}_{2-x}N{i}_{x}A{s}_2$ ($x$ = 0, 0.6)
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