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${}_2$.

arXiv comment9 pages, 7 figures

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• Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in Sr${}_2$RuO${}_4$
• Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors
• The transport-structural correspondence across the nematic phase transition probed by elasto-x-ray diffraction
• Magnetoresistance scaling, disorder, `hot spots' and the origin of $T$-linear resistivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
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• In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe${}_2$As${}_2$
• Energy scale of nematic ordering in the parent iron-based superconductor:BaFe2As2
• Spin fluctuation anisotropy as a probe of orbital-selective hole-electron quasiparticle excitations in detwinned Ba(Fe1-xCox)2As2
• Heat-capacity measurements under uniaxial pressure using a piezo-driven device
• Anisotropic quasiparticle coherence in nematic BaFe${}_2$As${}_2$ studied with strain-dependent ARPES
• Low work function in the 122-family of iron-based superconductors
• Anomalous magneto-elastic coupling in Au-doped BaFe2As2
• Incoherent electronic band states in Mn-substituted BaFe${}_2$As${}_2$
• Uniaxial stress effect on the electronic structure of quantum materials
• Nematic superconductivity from selective orbital pairing in Ba(Fe1-xMx)2As2 (M = Co, Ni) single crystals
• Revealing the intrinsic superconducting gap anisotropy in surface-neutralized BaFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• The Future of the Correlated Electron Problem
• Transient gap generation in BaFe${}_2$As${}_2$ driven by coherent lattice vibrations
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Observation of Two Cascading Screening Processes in an Iron-based Superconductor
• Development of microwave surface elastoresistivity measurement technique under tunable strain
• Oxide MBE-ARPES at SSRL Beamline 5-2
• 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
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs
• 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)