Excitonic quasiparticles in a spin-orbit Mott insulator

Abstract

In condensed matter systems, out of a large number of interacting degrees of freedom emerge weakly coupled particles, in terms of which most physical properties are described. For example, Landau quasiparticles (QP) determine all electronic properties of a normal metal. The lack of identification of such QPs is major barrier for understanding myriad exotic properties of correlated electrons, such as unconventional superconductivity and non-Fermi liquid behaviours. Here, we report the observation of a composite particle in a Mott insulator Sr2IrO4---and exciton dressed with magnons---that propagates with the canonical characteristics of a QP: a finite QP residue and a lifetime longer than the hopping time scale. The dynamics of this charge-neutral bosonic excitation mirrors the fundamental process of the analogous one-hole propagation in the background of ordered spins, for which a well-defined QP has never been observed. The much narrower linewidth of the exciton reveals the same intrinsic dynamics that is obscured for the hole and is intimately related to the mechanism of high temperature superconductivity.

submitted version

References in corpus (27)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Isospin Dynamics in Sr2IrO4 : Forging Links to Cuprate Superconductivity
• Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
• Spin-Orbital Separation in the quasi 1D Mott-insulator Sr2CuO3
• Missing Quasiparticles and the Chemical Potential Puzzle in the Doping Evolution of the Cuprate Superconductors
• Crystal field splitting and correlation effect on the electronic structure of A2IrO3
• Polaron in t-J model
• Reduced effective spin-orbital degeneracy and spin-orbital ordering in paramagnetic transition metal oxides: Sr2IrO4 vs. Sr2RhO4
• Two-dimensional Heisenberg behavior of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4
• Evidence for Quasiparticle Decay in Photoemission from Underdoped Cuprates
• Angle-resolved photoemission in high Tc cuprates from theoretical viewpoints
• Spinons in the strongly correlated copper oxide chains in SrCuO2
• Dimensionality controlled Mott transition and correlation effects in single- and bi-layer perovskite iridates
• Visualizing the atomic scale electronic structure of the Ca2CuO2Cl2 Mott insulator
• Ab initio determination of excitation energies and magnetic couplings in correlated, quasi two-dimensional iridates
• Doping dependent quasiparticle band structure in cuprate superconductors
• Hole photoproduction in insulating copper oxide
• Low energy magnetic excitations in the spin-orbital Mott insulator Sr${}_2$IrO${}_4$
• Spectroscopic evidence for polaronic behaviour of the strong spin-orbit insulator Sr${}_3$Ir${}_2$O${}_7$
• Hole Doping Evolution of the Quasiparticle Band in Models of Strongly Correlated Electrons for the High-T_c Cuprates
• Spin and Orbital Contributions to Magnetically Ordered Moments in 5d Layered Perovskite Sr2IrO4
• Bulk Nature of Layered Perovskite Iridates beyond the Mott Scenario : An Approach from Bulk Sensitive Photoemission Study
• Turning insulators into superconductors
• Unconventional Superconductivity
• Microscopic and Spectroscopic Evidence for a Slater Metal-Insulator Transition in Sr2IrO4
• Hole Photoproduction in Insulating Copper Oxide

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