The key ingredients of the electronic structure of FeSe

Abstract

FeSe is a fascinating superconducting material at the frontier of research in condensed matter physics. Here we provide an overview on the current understanding of the electronic structure of FeSe, focusing in particular on its low energy electronic structure as determined from angular resolved photoemission spectroscopy, quantum oscillations and magnetotransport measurements of single crystal samples. We discuss the unique place of FeSe amongst iron-based superconductors, being a multi-band system exhibiting strong orbitally-dependent electronic correlations and unusually small Fermi surfaces, prone to different electronic instabilities. We pay particular attention to the evolution of the electronic structure which accompanies the tetragonal-orthorhombic structural distortion of the lattice around 90 K, which stabilizes a unique nematic electronic state. Finally, we discuss how the multi-band multi-orbital nematic electronic structure has an impact on the understanding of the superconductivity, and show that the tunability of the nematic state with chemical and physical pressure will help to disentangle the role of different competing interactions relevant for enhancing superconductivity.

21 pages, 11 figures, to appear in Annual Review of Condensed Matter Physics

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Cited by in corpus (75)

• Nematicity, magnetism and superconductivity in FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Exotic Superconducting States in FeSe-based Materials
• Theory of Cross Phenomena and Their Coefficients Beyond Onsager Theorem
• Berry connection polarizability tensor and third-order Hall effect
• Anisotropic spin fluctuations in detwinned FeSe
• Nanoscale decoupling of electronic nematicity and structural anisotropy in FeSe thin films
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Scattering mechanisms and electrical transport near an Ising nematic quantum critical point
• Strain-tuning of nematicity and superconductivity in single crystals of FeSe
• Quantum Phase Transition in the Yukawa-SYK Model
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Revealing the single electron pocket of FeSe in a single orthorhombic domain
• Thermodynamics of transition to BCS-BEC crossover superconductivity in FeSe${}_{1-x}$S${}_x$
• Multiflavor Mott insulators in quantum materials and ultracold atoms
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Singular magnetic anisotropy in the nematic phase of FeSe
• Quasiparticle Nodal Plane in the Fulde-Ferrell-Larkin-Ovchinnikov State of FeSe
• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• Evolution of transport properties in FeSe thin flakes with thickness approaching the two-dimensional limit
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multi-orbital correlated electron systems
• Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
• Intertwined spin-orbital coupled orders in the iron-based superconductors
• Suppression of fluctuations in a two-band superconductor with a quasi-1D band
• FeSe and the missing electron pocket problem
• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• Twisted-bilayer FeSe and the Fe-based superlattices
• $B^2$ to $B$-linear magnetoresistance due to impeded orbital motion
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• Low frequency Raman response near Ising-nematic quantum critical point: a memory matrix approach
• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure
• Pure nematic state in iron-based superconductor
• Role of nematicity in controlling spin fluctuations and superconducting Tc in bulk FeSe
• Unconventional localization of electrons inside of a nematic electronic phase
• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
• Nematic state of the FeSe superconductor
• Multi-band description of the upper critical field of bulk FeSe
• Anomalous contribution to the nematic electronic states from the structural transition in FeSe revealed by time- and angle-resolved photoemission spectroscopy
• High-$T_c$ Berezinskii-Kosterlitz-Thouless transition in 2D superconducting systems with coupled deep and quasi-flat electronic bands with van Hove singularities
• Nematic spin correlations pervading the phase diagram of FeSe${}_{1-x}$S${}_x$
• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
• Dual Bethe-Salpeter equation for the multi-orbital lattice susceptibility within dynamical mean-field theory
• Accurate modeling of FeSe with screened Fock exchange and Hund's metal correlations
• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe
• A topological flux trap: Majorana bound states at screw dislocations
• Magnetotransport properties of FeSe in fields up to 50T
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• Rotation of the dislocation grid in multilayer FeSe films and visualization of electronic nematic domains via orbital-selective tunneling
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• In-situ electrical and thermal transport properties of FeySe1-xTex films with ionic liquid gating
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
• Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe
• Tuning Bound States of Symmetry-Breaking Vortices via Unidirectional Charge Density Wave in a Transition-Metal Dichalcogenide Superconductor
• Representation-protected topology of spin-singlet $s$-wave superconductors
• Unconventional superconductivity induced by suppressing an iron-selenium based Mott insulator CsFe4-xSe4
• Odd-Parity Magnetism in Fe-Based Superconductors
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• Unusual normal and superconducting state properties observed in hydrothermal Fe1-xSe flakes
• Multiband effect in elastoresistance of Fe(Se,Te)
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• Effects of Chemical Pressure on Superconductivity in Electrochemically Intercalated (TMA)yFe2(Se1-xSx)2 (TMA = Tetramethylammonium)
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe
• Decoupled nematic and magnetic criticality in FeSe${}_{1-x}$S${}_x$
• Enhancement of Superconductivity Linked with Linear-in-Temperature/Field Resistivity in Ion-Gated FeSe Films
• Robustness of superconducting properties to transition metal substitution and impurity phases in Fe1-xVxSe
• Specific Heat and the gap structure of a Nematic Superconductor, application to FeSe
• Superconductivity near an Ising nematic quantum critical point in two dimensions
• Symmetry-breaking-induced topology in FeSe
• Orbitally resolved superconductivity in real space: FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe