Anomalous temperature evolution of the electronic structure of FeSe

Abstract

We present ARPES data taken from the structurally simplest representative of iron-based superconductors, FeSe, in a wide temperature range. Apart from the variations related to the nematic transition, we detect very pronounced shifts of the dispersions on the scale of hundreds of kelvins. Remarkably, upon warming the sample up, the band structure has a tendency to relax to the one predicted by conventional band structure calculations, right opposite to what is intuitively expected. Our findings shed light on the origin of the dominant interaction shaping the electronic states responsible for high-temperature superconductivity in iron-based materials.

8 pages, 4 figures, PDF only

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• The key ingredients of the electronic structure of FeSe
• Exotic Superconducting States in FeSe-based Materials
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Temperature-Induced Lifshitz Transition and Possible Excitonic Instability in ZrSiSe
• 3D superconducting gap in FeSe from ARPES
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Understanding Electronic Peculiarities in Tetragonal FeSe as Local Structural Symmetry Breaking
• Mass enhancement in 3d and s-p perovskites from symmetry breaking
• Effect of non-local correlations on the electronic structure of LiFeAs
• Correlation strength, Lifshitz transition and the emergence of a two- to three-dimensional crossover in FeSe under pressure
• Collapse of critical nematic fluctuations in FeSe under pressure
• Non-local correlations in Iron Pnictides and Chalcogenides
• Close proximity of FeSe to a magnetic quantum critical point as revealed by high-resolution $\mu$SR measurements
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Electronic band structure of optimal superconductors: from cuprates to ferropnictides and back again
• 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
• Energy scale of nematic ordering in the parent iron-based superconductor:BaFe2As2
• Momentum-resolved measurement of electronic nematic susceptibility in the FeSe${}_{0.9}$S${}_{0.1}$ superconductor
• Strongly correlated superconductor with polytypic 3D Dirac points
• Dynamical susceptibility of a near-critical non-conserved order parameter and B2g Raman response in Fe-based superconductors
• Variation of carrier density in semimetals via short-range correlation: A case study with nickelate NdNiO${}_2$
• `Interaction annealing' to determine effective quantized valence and orbital structure: an illustration with ferro-orbital order in WTe${}_2$
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$