Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr${}_2$IrO${}_4$

Abstract

Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudogap. The relation between this state and superconductivity is intensely studied but remains controversial. The discrimination between competing theoretical models is hindered by a lack of electronic structure data from related doped Mott insulators. Here we report the doping evolution of the Heisenberg antiferromagnet Sr${}_2$IrO${}_4$, a close analogue to underdoped cuprates. We demonstrate that metallicity emerges from a rapid collapse of the Mott gap with doping, resulting in lens-like Fermi contours rather than disconnected Fermi arcs as observed in cuprates. Intriguingly though, the emerging electron liquid shows nodal quasiparticles with an antinodal pseudogap and thus bares strong similarities with underdoped cuprates. We conclude that anisotropic pseudogaps are a generic property of two-dimensional doped Mott insulators rather than a unique hallmark of cuprate high-temperature superconductivity.

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Cited by in corpus (101)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Observation of a $d$-wave gap in electron-doped Sr${}_2$IrO${}_4$
• Evidence of an odd-parity hidden order in a spin-orbit coupled correlated iridate
• Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator Sr${}_2$IrO${}_4$
• Signature of high temperature superconductivity in electron doped Sr2IrO4
• Universality of pseudogap and emergent order in lightly doped Mott insulators
• Square Lattice Iridates
• Slater to Mott crossover in the metal to insulator transition of Nd2Ir2O7
• In-situ strain-tuning of the metal-insulator-transition of Ca${}_2$RuO${}_4$ in angle-resolved photoemission experiments
• Persistent paramagnons deep in the metallic phase of Sr${}_{2-x}$La${}_x$IrO${}_4$
• Coulomb Correlations in 4d and 5d Oxides from First Principles - or How Spin-Orbit Materials choose their Effective Orbital Degeneracies
• Spin-orbit entangled j=1/2 moments in Ba${}_2$CeIrO${}_6$ -- a frustrated fcc quantum magnet
• A charge density wave-like instability in a doped spin-orbit-assisted weak Mott insulator
• Relativistic $GW$+BSE study of the optical properties of Ruddlesden-Popper iridates
• Crystal growth and intrinsic magnetic behavior of Sr${}_2$IrO${}_4$
• Dimensionality-strain phase diagram of strontium iridates
• Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4
• Raman scattering study of vibrational and magnetic excitations in Sr${}_{2-x}$La${}_x$IrO${}_4$
• Unidirectional spin density wave state in metallic (Sr1-xLax)2IrO4
• Anisotropic exchange and spin-wave damping in pure and electron-doped Sr${}_2$IrO${}_4$
• The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions
• Electron and hole doping in the relativistic Mott insulator Sr${}_2$IrO${}_4$: a first-principles study using band unfolding technique
• Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr${}_{1-x}$La${}_x$)${}_3$Ir${}_2$O${}_7$
• Poor electronic screening in lightly doped Mott insulators observed with scanning tunneling microscopy
• Correlation effects and hidden spin-orbit entangled electronic order in parent and electron-doped iridates Sr${}_2$IrO${}_4$
• First-Principles Calculation of Spin and Orbital Contributions to Magnetically Ordered Moments in Sr${}_2$IrO${}_4$
• Effect of Cu${}^{2+}$ substitution in Spin-Orbit Coupled Sr${}_2$Ir${}_{1-x}$Cu${}_x$O${}_4$: Structure, magnetism and electronic properties
• Anisotropic softening of magnetic excitations in lightly electron doped Sr${}_2$IrO${}_4$
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• Atomic-scale fragmentation and collapse of antiferromagnetic order in a doped Mott insulator
• Direct visualization of ambipolar Mott transition in cuprate CuO2 planes
• Variational cluster approach to thermodynamic properties of interacting fermions at finite temperatures: A case study of the two-dimensional single-band Hubbard model at half filling
• Possible quantum paramagnetism in compressed Sr${}_2$IrO${}_4$
• Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4
• Spin-orbit-enhanced magnetic surface second-harmonic generation in Sr${}_2$IrO${}_4$
• Formation of an incoherent metallic state in Rh-doped Sr${}_2$IrO${}_4$
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr${}_2$(Ir${}_{1-x}$Rh${}_x$)O${}_4$
• Correlation induced electron-hole asymmetry in quasi-2D iridates
• Evolution of remnant Fermi surface state in lightly-doped correlated spin-orbit insulator Sr${}_{2-x}$La${}_x$IrO${}_4$
• ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr2IrO4
• Non-local Coulomb correlations in pure and electron-doped ${\mathrm{Sr}}_2{\mathrm{IrO}}_4$: spectral functions, Fermi surface and pseudogap-like spectral weight distributions from oriented cluster dynamical mean field theory
• Magnetic properties of bilayer Sr${}_3$Ir${}_2$O${}_7$: role of epitaxial strain and oxygen vacancies
• Charge Transfer and $dd$ excitations in AgF${}_2$
• Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates
• Possibility to realize spin-orbit-induced correlated physics in iridium fluorides
• Pseudogap and electronic structure of electron-doped Sr${}_2$IrO${}_4$
• Spectroscopic evidence for electron-boson coupling in electron-doped Sr${}_2$IrO${}_4$
• Tuning of the Ru${}^{4+}$ ground-state orbital population in the $4{\mathbf{d}}^4$ Mott insulator Ca${}_2$RuO${}_4$ achieved by La doping
• Time resolved photoemission of Sr${}_2$IrO${}_4$
• Odd-Parity Superconductivity Driven by Octahedra Rotations in Iridium Oxides
• Persistent large anisotropic magnetoresistance and insulator to metal transition in spin-orbit coupled antiferromagnets Sr2(Ir1-xGax)O4
• Light-induced insulator-metal transition in Sr${}_2$IrO${}_4$ reveals the nature of the insulating ground state
• Persistence of antiferromagnetic order upon La substitution in the $4d^4$ Mott insulator Ca${}_2$RuO${}_4$
• Decoupling of static and dynamic criticality in a driven Mott insulator
• Non-collinear vs collinear description of the Ir-based one-$t_{2g}$ -hole perovskite-related compounds: SrIrO${}_3$ and Sr${}_2$IrO${}_4$
• Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$
• Sr${}_2$RuO${}_4$, like doped cuprates and barium bismuthate, is a negative charge-transfer gap even parity superconductor with $\frac{3}{4}$-filled oxygen band
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• Mott transition and collective charge pinning in electron doped Sr2IrO4
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• Nonsymmorphic Dirac semimetal and carrier dynamics in doped spin-orbit-coupled Mott insulator Sr${}_2$IrO${}_4$
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• Doping driven structural distortion in the bilayer iridate (Sr${}_{1-x}$La${}_x$)${}_3$Ir${}_2$O${}_7$
• Influence of multiplet structure on photoemission spectra of spin-orbit driven Mott insulators: application to $\mathbf{S}{\mathbf{r}}_2\mathbf{Ir}{\mathbf{O}}_4$
• Multiband $d-p$ model and self-doping in the electronic structure of Ba${}_2$IrO${}_4$
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• Single crystal growth of iridates without platinum impurities
• Correlated motion of particle-hole excitations across the renormalized spin-orbit gap in $\mathrm{S}{\mathrm{r}}_2\mathrm{Ir}{\mathrm{O}}_4$
• Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system
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• Polarized Raman spectroscopy study of metallic $(S{r}_{1-x}L{a}_x{)}_{3}I{r}_2{O}_7$: a consistent picture of disorder-interrupted unidirectional charge order
• Possible superconductivity induced by a large spin-orbit coupling in carrier doped iridium oxide insulators: A weak coupling approach
• Low-energy electrodynamics of Dirac semimetal phases in the doped Mott insulator Sr${}_2$IrO${}_4$
• Spin-polaron ladder spectrum of the spin-orbit-induced Mott insulator Sr${}_2$IrO${}_4$ probed by scanning tunneling spectroscopy
• Evidence of Mott Insulator with Thermally Induced Melting Behavior in Kagome Compound Nb3Cl8
• Electron doping in ${\text{Sr}}_3{\text{Ir}}_2{\text{O}}_7$: collapse of band gap and magnetic order
• Evolution of electronic structure of Ru-doped single-crystal iridiates, Sr${}_2$Ir${}_{1-x}$Ru${}_x$O${}_4$
• Anomalous Fermi pockets on Hund's metal surface of Sr2RuO4 induced by the correlation-enhanced spin-orbit coupling
• Strain tunable electronic ground states in two-dimensional iridate thin films
• The rich phase diagram of the prototypical iridate Ba${}_2$IrO${}_4$: Effective low-energy models and metal-insulator transition
• Magnetic and electronic properties of La${}_{3}M$O${}_7$ and possible polaron formation in hole-doped La${}_{3}M$O${}_7$ ($M$=Ru and Os)
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$
• Spin and charge order in doped spin-orbit coupled Mott insulators
• High-pressure floating zone crystal growth of Sr${}_2$IrO${}_4$
• The occurrence of a Mott-like gap in single-particle spectra of electron systems possessing flat bands
• Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator
• Three-dimensional Stacking of Canted Antiferromagnetism and Pseudospin Current in Undoped Sr${}_2$IrO${}_4$: Symmetry Analysis and Microscopic Model Realization
• Microscopic model realization of $\mathbf{d}$-wave pseudospin current order in Sr${}_2$IrO${}_4$
• Putative magnetic quantum criticality in (Sr${}_{\text{1-x}}$La${}_{\text{x}}$)${}_{\text{3}}$Ir${}_{\text{2}}$O${}_{\text{7}}$
• Two dimensional electron gas in the $\delta$-doped iridates with strong spin-orbit coupling: La${}_{\delta }$Sr${}_2$IrO${}_4$
• Evidence for strong electron correlations in a non-symmorphic Dirac semimetal
• Magnetic polarons due to spin-length fluctuations in ${\mathbf{d}}^4$ spin-orbit Mott systems
• Fermi surface and pseudogap in highly doped Sr${}_2$IrO${}_4$
• Spontaneous emergence of altermagnetism in the single-orbital extended Hubbard model