Abstract
In order to numerically study electron correlation effects in multiorbital systems, we propose a new type of discrete transformation for the exchange (Hund’s coupling) and pair-hopping interactions to be used in the dynamical mean field Monte Carlo method. The transformation, which is real and exact, turns out to suppress the sign problem in a wide parameter region including non-half-filled bands. This enables us to obtain the dominant pairing symmetry in the double-orbital Hubbard model, which shows that the spin-triplet, orbital-antisymmetric pairing that exploits Hund’s coupling is stable in a wide region of the band filling.
- Received 20 May 2004
DOI:https://doi.org/10.1103/PhysRevB.70.172504
©2004 American Physical Society