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.

arXiv comment21 pages, 11 figures, to appear in Annual Review of Condensed Matter Physics

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Cited by in corpus (125)

• Nematicity, magnetism and superconductivity in FeSe
• Observation of half-integer level shift of vortex bound states in an iron-based superconductor
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Exotic Superconducting States in FeSe-based Materials
• Theory of nonreciprocal Josephson effect
• Imaging Orbital-selective Quasiparticles in the Hund's Metal State of FeSe
• Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Theory of Cross Phenomena and Their Coefficients Beyond Onsager Theorem
• Berry connection polarizability tensor and third-order Hall effect
• Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
• Type-II Ising superconductivity in two-dimensional materials with strong spin-orbit coupling
• Anisotropic spin fluctuations in detwinned FeSe
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Nanoscale decoupling of electronic nematicity and structural anisotropy in FeSe thin films
• Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
• Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
• Superconductivity in FeSe: the role of nematic order
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
• Scattering mechanisms and electrical transport near an Ising nematic quantum critical point
• Scaling of the superconducting gap with orbital character in FeSe
• ComDMFT: a Massively Parallel Computer Package for the Electronic Structure of Correlated-Electron Systems
• Strain-tuning of nematicity and superconductivity in single crystals of FeSe
• Quantum Phase Transition in the Yukawa-SYK Model
• Superconductivity near a nematic quantum critical point -- the interplay between hot and lukewarm regions
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Nodal gaps in the nematic superconductor FeSe from heat capacity
• Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$
• Revealing the single electron pocket of FeSe in a single orthorhombic domain
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Thermodynamics of transition to BCS-BEC crossover superconductivity in FeSe${}_{1-x}$S${}_x$
• Dynamical susceptibility near a long-wavelength critical point with a nonconserved order parameter
• Resistivity near a nematic quantum critical point: Impact of acoustic phonons
• Time-reversal symmetry-breaking nematic superconductivity in FeSe
• Multiflavor Mott insulators in quantum materials and ultracold atoms
• Correlation strength, Lifshitz transition and the emergence of a two- to three-dimensional crossover in FeSe under pressure
• Orbital order in FeSe - the case for vertex renormalization
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Collapse of critical nematic fluctuations in FeSe under pressure
• Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures
• Observation of the in-plane magnetic field-induced phase transitions in FeSe
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Spin-Orbital-Intertwined Nematic State in FeSe
• Non-local correlations in Iron Pnictides and Chalcogenides
• 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
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• $k_z$ selective scattering within Quasiparticle Interference measurements of FeSe
• Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering
• 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
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Correlated electronic structure, orbital-dependent correlations, and Lifshitz transition in tetragonal FeS
• Intertwined spin-orbital coupled orders in the iron-based superconductors
• Suppression of fluctuations in a two-band superconductor with a quasi-1D band
• 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
• Disorder-sensitive node-like small gap in FeSe
• Twisted-bilayer FeSe and the Fe-based superlattices
• $B^2$ to $B$-linear magnetoresistance due to impeded orbital motion
• Towards exact solutions for the superconducting $T_c$ induced by electron-phonon interaction
• DC resistivity near a nematic quantum critical point: Effects of weak disorder and acoustic phonons
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• Low frequency Raman response near Ising-nematic quantum critical point: a memory matrix approach
• Dynamical susceptibility of a near-critical non-conserved order parameter and B2g Raman response in Fe-based superconductors
• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• 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
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• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
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• Multi-band description of the upper critical field of bulk FeSe
• Nematic state of the FeSe superconductor
• Orbital loop currents in iron-based superconductors
• Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors
• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
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• Nematic spin correlations pervading the phase diagram of FeSe${}_{1-x}$S${}_x$
• Dual Bethe-Salpeter equation for the multi-orbital lattice susceptibility within dynamical mean-field theory
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• Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe
• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors
• Laser-induced coherent control of an electronic nematic quantum phase transition
• A topological flux trap: Majorana bound states at screw dislocations
• Magnetotransport properties of FeSe in fields up to 50T
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• Nematic properties of FeSe${}_{1-x}$Te${}_x$ crystals with a low Te content
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• Rotation of the dislocation grid in multilayer FeSe films and visualization of electronic nematic domains via orbital-selective tunneling
• In-situ electrical and thermal transport properties of FeySe1-xTex films with ionic liquid gating
• 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
• Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$
• Majority carrier type inversion in FeSe family and "doped semimetal" scheme in iron-based superconductors
• Unusual normal and superconducting state properties observed in hydrothermal Fe1-xSe flakes
• Odd-Parity Magnetism in Fe-Based Superconductors
• Representation-protected topology of spin-singlet $s$-wave superconductors
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• Unconventional superconductivity induced by suppressing an iron-selenium based Mott insulator CsFe4-xSe4
• Itinerant fermions on a triangular lattice: unconventional magnetism and other ordered states
• Effects of Chemical Pressure on Superconductivity in Electrochemically Intercalated (TMA)yFe2(Se1-xSx)2 (TMA = Tetramethylammonium)
• 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
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15
• Superconductivity near an Ising nematic quantum critical point in two dimensions
• Symmetry-breaking-induced topology in FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe
• Decoupled nematic and magnetic criticality in FeSe${}_{1-x}$S${}_x$
• Specific Heat and the gap structure of a Nematic Superconductor, application to FeSe
• 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
• Orbitally resolved superconductivity in real space: FeSe
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe