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摘要
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 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.
- 出版日期2013-5-10
