Abstract
The physics of doped Mott insulators remains controversial after decades of active research, hindered by the interplay among competing orders and fluctuations. It is thus highly desired to distinguish the intrinsic characters of the Mott-metal crossover from those of other origins. Here we investigate the evolution of electronic structure and dynamics of the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4. The effective hole doping is achieved by replacing Ir with Rh atoms, with the chemical potential immediately jumping to or near the top of the lower Hubbard band. The doped iridates exhibit multiple iconic low-energy features previously observed in doped cuprates—pseudogaps, Fermi arcs and marginal-Fermi-liquid-like electronic scattering rates. We suggest these signatures are most likely an integral part of the material's proximity to the Mott state, rather than from many of the most claimed mechanisms, including preformed electron pairing, quantum criticality or density-wave formation.
Highlights
The physics of doped Mott insulators remains controversial after decades of active research, hindered by the interplay among competing orders and fluctuations
While the past three decades have witnessed tremendous progress in characterizing the phenomenology of the high-Tc cuprates, the interpretation of most of these experimental observations remains highly controversial. It has become essentially inseparable whether such exotic phenomena as pseudogaps and marginal Fermi liquid (MFL) scattering rates[2,3,4,5] arise from the metal-insulator transition, certain density-wave instabilities[6] or are fluctuations of the superconductivity[7]
Effective hole doping via Rh substitution
Summary
The physics of doped Mott insulators remains controversial after decades of active research, hindered by the interplay among competing orders and fluctuations. While the past three decades have witnessed tremendous progress in characterizing the phenomenology of the high-Tc cuprates, the interpretation of most of these experimental observations remains highly controversial It has become essentially inseparable whether such exotic phenomena as pseudogaps and marginal Fermi liquid (MFL) scattering rates[2,3,4,5] arise from the metal-insulator transition, certain density-wave instabilities[6] or are fluctuations of the superconductivity[7]. We show in the effectively hole-doped Sr2IrO4 the emergence of pseudogaps, Fermi arcs and marginal-Fermi-liquid-like electronic scattering rates, features first reported and/or most famous in doped cuprate Mott insulators. It appears these iridates resemble cuprates structurally and in terms of electronic structures
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