Lifted electron pocket and reversed orbital occupancy imbalance in FeSe

Abstract

The FeSe nematic phase has been the focus of recent research on iron based superconductors (IBSs) due to its unique properties. A number of electronic structure studies were performed to find the origin of the phase. However, such attempts came out with conflicting results and caused additional controversies. Here, we report results from angle resolved photoemission and X-ray absorption spectroscopy studies on FeSe with detwinning by a piezo stack. We have fully resolved band dispersions with orbital characters near the Brillouin zone corner which reveals absence of a Fermi pocket at the Y point in the 1Fe Brillouin zone. In addition, the occupation imbalance between dxz and dyz orbitals is found to be opposite to that of iron pnictides, which is consistent with the identified band characters. These results settle down controversial issues in the FeSe nematic phase and shed light on the origin of nematic phases in IBSs.

arXiv comment19 pages, 4 figures

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• Deep learning-based statistical noise reduction for multidimensional spectral data
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Revealing the single electron pocket of FeSe in a single orthorhombic domain
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• A Rigorous Formalism of Unconventional Symmetry Breaking in Fermi Liquid Theory and Its Application to Nematicity in FeSe
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Electronic nematicity in FeSe: a first-principles perspective
• Singular magnetic anisotropy in the nematic phase of FeSe
• Spontaneous orbital polarization in the nematic phase of FeSe
• $k_z$ selective scattering within Quasiparticle Interference measurements of FeSe
• Raman response in the nematic phase of FeSe
• Orbital transmutation and the electronic spectrum of FeSe in the nematic phase
• FeSe and the missing electron pocket problem
• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• Tomonaga Luttinger liquid in the topological edge channel of multilayer FeSe
• Accurate modeling of FeSe with screened Fock exchange and Hund's metal correlations
• Cu doping effects on the electronic structure of Fe1-xCuxSe
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe
• Specific Heat and the gap structure of a Nematic Superconductor, application to FeSe