The excitation gaps for the two-orbital degenerate Hubbard model are investigated by applying a generalized version of Lieb's spin-reflection positivity. Combining the known exact results on the ground state, and making use of symmetry properties, we rigorously show that, at half-filling, the charge gaps are always larger than the spin-excitation gaps and properly defined orbital gaps.
Excitation gaps in the orbitally degenerate Hubbard model
Noce C
2006
Abstract
The excitation gaps for the two-orbital degenerate Hubbard model are investigated by applying a generalized version of Lieb's spin-reflection positivity. Combining the known exact results on the ground state, and making use of symmetry properties, we rigorously show that, at half-filling, the charge gaps are always larger than the spin-excitation gaps and properly defined orbital gaps.File in questo prodotto:
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