A new numerical algorithm for the double-orbital Hubbard model -- Hund-coupled pairing symmetry in the doped case
Strongly Correlated Electrons
2009-11-10 v1 Superconductivity
Abstract
In order to numerically study electron correlation effects in multi-orbital 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 theory + quantum 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.
Cite
@article{arxiv.cond-mat/0405503,
title = {A new numerical algorithm for the double-orbital Hubbard model -- Hund-coupled pairing symmetry in the doped case},
author = {Shiro Sakai and Ryotaro Arita and Hideo Aoki},
journal= {arXiv preprint arXiv:cond-mat/0405503},
year = {2009}
}
Comments
4 pages, 4 figures