Hidden Charge 2e Boson: Experimental Consequences for Doped Mott Insulators

Abstract

We show here that many of the normal state properties of the cuprates can result from the new charge 2e bosonic field which we have recently (Phys. Rev. Lett. {\bf 99}, 46404 (2007) and Phys. Rev. B 77, 014512 (2008)) shown to exist in the exact low-energy theory of a doped Mott insulator. In particular, the 1) mid-infrared band including the non-vanishing of the restricted f-sum rule in the Mott insulator, 2) the $T^2$ contribution to the thermal conductivity, 3) the pseudogap, 4) the bifurcation of the electron spectrum below the chemical potential as recently seen in angle-resolved photoemission, 5) insulating behaviour away from half-filling, 6) the high and low-energy kinks in the electron dispersion and 7) T-linear resistivity all derive from the charge 2e bosonic field. We also calculate the inverse dielectric function and show that it possesses a sharp quasiparticle peak and a broad particle-hole continuum. The sharp peak is mediated by a new charge e composite excitation formed from the binding of a charge 2e boson and a hole and represents a distinctly new prediction of this theory. It is this feature that is responsible for dynamical part of the spectral weight transferred across the Mott gap. We propose that electron energy loss spectroscopy at finite momentum and frequency can be used to probe the existence of such a sharp feature.

Published verion

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Cited by in corpus (12)

• Mottness: Identifying the Propagating Charge Modes in doped Mott Insulators
• Optical conductivity in cluster dynamical mean field theory: formalism and application to high temperature superconductors
• Mottness in High-Temperature Copper-Oxide Superconductors
• Mottness on a triangular lattice
• Emergence of Particle-Hole Symmetry near Optimal Doping in High-Temperature Copper Oxide Superconductors
• Kinks and Mid-Infrared Optical Conductivity from Strong Electron Correlation
• Mottness Collapse and T-linear Resistivity in Cuprate Superconductors
• Origin of the Mott Gap
• Power-law Optical Conductivity from Unparticles: Application to the Cuprates
• Towards the Standard Model of Fermi Arcs from a Wilsonian Reduction of the Hubbard Model
• Charge 2e Boson Underlies Two - Fluid Model of the Pseudogap in Cuprate Superconductors
• Non-conservation of Fermionic Degrees of Freedom at Low-energy in Doped Mott Insulators