Charge and spin structures of a superconductor in the proximity of an antiferromagnetic Mott insulator

F. Assaad, M. Imada

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

To the Hubbard model on a square lattice we add an interaction (Formula presented) that depends upon the square of a near-neighbor hopping. We use zero-temperature quantum Monte Carlo simulations on lattice sizes up to (Formula presented) to show that at half-filling and constant value of the Hubbard repulsion, the interaction (Formula presented) triggers a quantum transition between an antiferromagnetic Mott insulator and a (Formula presented) superconductor. With a combination of finite-temperature quantum Monte Carlo simulations and the maximum entropy method, we study spin and charge degrees of freedom in the superconducting state. We give numerical evidence for the occurrence of a finite-temperature Kosterlitz-Thouless transition to the (Formula presented) superconducting state. Above and below the Kosterlitz-Thouless transition temperature, (Formula presented) we compute the one-electron density of states (Formula presented) the spin relaxation rate (Formula presented) as well as the imaginary and real part of the spin susceptibility (Formula presented) The spin dynamics are characterized by the vanishing of (Formula presented) and divergence of (Formula presented) in the low-temperature limit. As (Formula presented) is approached (Formula presented) develops a pseudogap feature and below (Formula presented) shows a peak at finite frequency.

Original languageEnglish
Pages (from-to)15001-15014
Number of pages14
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number23
DOIs
Publication statusPublished - 1997 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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