Numerical solution of the t-J model with random exchange couplings in d=infinity dimensions

Abstract

To explore the nature of the metallic state near the transition to a Mott insulator we investigate the t-J model with random exchange interaction in d=infinity dimensions. A numerically exact solution is obtained by an extension of the continuous-time quantum Monte Carlo (CT-QMC) method to the case of a vector bosonic field coupled to a local spin. We show that the paramagnetic solution near the Mott insulator describes an incoherent metal with a residual moment, and that single-particle excitations produce an additional band, which is separated from the Mott-Hubbard band.

5 pages, 3 figures

References in corpus (5)

• Continuous-time Monte Carlo methods for quantum impurity models
• Evolution of electronic structure of doped Mott insulators - reconstruction of poles and zeros of Green's function
• Efficient DMFT-simulation of the Holstein-Hubbard Model
• Spin-boson coupling in continuous-time quantum Monte Carlo
• Luttinger sum rule for finite systems of correlated electrons

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• Extremely Correlated Fermi Liquids in the limit of infinite dimensions
• Modulation of pairing symmetry with bond disorder in unconventional superconductors