Charge dynamics in the phase string model for high-Tc superconductors

Abstract

An understanding of the anomalous charge dynamics in the high-Tc cuprates is obtained based on a model study of doped Mott insulators. The high-temperature optical conductivity is found to generally have a two-component structure: a Drude like part followed by a mid-infrared band. The scattering rate associated with the Drude part exhibits a linear-temperature dependence over a wide range of high temperature, while the Drude term gets progressively suppressed below a characteristic energy of magnetic origin as the system enters the pseudogap phase. The high-energy optical conductivity shows a resonancelike feature in an underdoped case and continuously evolves into a 1/ωtail at higher doping, indicating that they share the same physical origin. In particular, such a high-energy component is closely correlated with the ω-peak structure of the density-density correlation function at different momenta, in systematic consistency with exact diagonalization results based on the t-J model. The underlying physics is attributed to the high-energy spin-charge separation in the model, in which the "mode coupling" responsible for the anomalous charge properties is not between the electrons and some collective mode but rather between new charge carriers, holons, and a novel topological gauge field controlled by spin dynamics, as the consequence of the strong short-range electron-electron Coulomb repulsion in the doped Mott insulator.

19 pages, 13 figures; final version to appear in Phys. Rev. B

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• Resistivity and optical conductivity of cuprates within the t-J model
• Spin dynamics in a doped-Mott-insulator superconductor
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• Upper Pseudogap Phase: Magnetic Characterizations
• Nature of spin-charge separation
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• Bosonic resonating valence bond wave function for doped Mott insulators

Cited by in corpus (5)

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• Mott physics, sign structure, ground state wavefunction, and high-Tc superconductivity
• Electric transport in doped Mott insulators dictated by a non-Ioffe-Larkin composition rule and spinons
• Statistical fluxes and the Curie-Weiss metal state
• Effect of phase string on single-hole dynamics in the two-leg Hubbard ladder