Mottness at finite doping and charge-instabilities in cuprates

Abstract

The intrinsic instability of underdoped copper oxides towards inhomogeneous states is one of the central puzzles of the physics of correlated materials. The influence of the Mott physics on the doping-temperature phase diagram of copper oxides represents a major issue that is subject of intense theoretical and experimental effort. Here, we investigate the ultrafast electron dynamics in prototypical single-layer Bi-based cuprates at the energy scale of the O-2p$\to$Cu-3d charge-transfer (CT) process. We demonstrate a clear evolution of the CT excitations from incoherent and localized, as in a Mott insulator, to coherent and delocalized, as in a conventional metal. This reorganization of the high-energy degrees of freedom occurs at the critical doping p${}_{cr}\simeq$0.16 irrespective of the temperature, and it can be well described by dynamical mean field theory calculations. We argue that the onset of the low-temperature charge instabilities is the low-energy manifestation of the underlying Mottness that characterizes the p<p${}_{cr}$ region of the phase diagram. This discovery sets a new framework for theories of charge order and low-temperature phases in underdoped copper oxides.

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• A Tale of Two Metals: contrasting criticalities in the pnictides and hole-doped cuprates
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• Cavity magnon-polaritons in cuprate parent compounds
• Dynamics of correlation-frozen antinodal quasiparticles in superconducting cuprates
• Doped NiO: the Mottness of a charge transfer insulator
• Photo-enhanced excitonic correlations in a Mott insulator with nonlocal interactions
• Photoinduced absorptions inside the Mott gap in the two-dimensional extended Hubbard model
• Particle-hole character of the Higgs and Goldstone modes in strongly-interacting lattice bosons
• Competition between spin ordering and superconductivity near the pseudogap boundary in La2-xSrxCuO4: insights from NMR
• Probing the Lattice Anharmonicity of Superconducting YBa${}_2$Cu${}_3$O${}_{7-\delta }$ Via Phonon Harmonics
• Rabi-resonant behavior of periodically-driven correlated fermion systems
• Dynamics of non-thermal states in optimally-doped $B{i}_{2}S{r}_{2}C{a}_{0.92}{Y}_{0.08}C{u}_2{O}_{8+\delta }$ revealed by mid-infrared three-pulse spectroscopy
• Ultrafast orbital manipulation and Mott physics in multi-band correlated materials
• Charge-Density-Wave State in Extremely Overdoped Cuprates Driven by Phonons
• Optical absorption activated by an ultrashort half-cycle pulse in metallic and superconducting states of the Hubbard model
• Ultrafast charge-transfer dynamics in Ca${}_2$CuO${}_2$Cl${}_2$ from time-resolved optical reflectivity
• Determination and correction of spectral phase from principal component analysis of coherent phonons