Spin-orbital gap of multiorbital antiferromagnet

Details Spin-orbital gap of multiorbital antiferromagnet Spin-orbital gap of multiorbital antiferromagnet

2006-04-04

arxiv.org/abs/cond-mat/0604076v2

Phys. Rev. B 75 (2007) 014410

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures, extended version

Scientific paper

In order to discuss the spin-gap formation in a multiorbital system, we analyze an e_g-orbital Hubbard model on a geometrically frustrated zigzag chain by using a density-matrix renormalization group method. Due to the appearance of a ferro-orbital arrangement, the system is regarded as a one-orbital system, while the degree of spin frustration is controlled by the spatial anisotropy of the orbital. In the region of strong spin frustration, we observe a finite energy gap between ground and first-excited states, which should be called a spin-orbital gap. The physical meaning is clarified by an effective Heisenberg spin model including correctly the effect of the orbital arrangement influenced by the spin excitation.

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