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math-ph2003★ 27 cited
Segregation in the asymmetric Hubbard model
Daniel Ueltschi
We study the `asymmetric' Hubbard model, where hoppings of electrons depend on their spin. For strong interactions and sufficiently asymmetric hoppings, it is proved that the groun…
math-ph2003★ 3 cited
Cluster expansions and correlation functions
Daniel Ueltschi
A cluster expansion is proposed, that applies to both continuous and discrete systems. The assumption for its convergence involves an extension of the neat Kotecky-Preiss criterion…