Numerical algorithm for the double-orbital Hubbard model: Hund-coupled pairing symmetry in the doped case

Article

关键词: QUANTUM MONTE-CARLO;    INFINITE DIMENSIONS;    FERROMAGNETISM;    TRANSITION;    DEGENERACY;    SYSTEMS;    LATTICE;    METALS;   

DOI  :  10.1103/PhysRevB.70.172504

来源: SCIE

【 摘 要 】

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 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.

【 授权许可】

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