Formation of local moment near a static vacancy in the one-dimensional large-U Hubbard model

Author： Sa Debanand  

Publisher： Edp Sciences

E-ISSN： 1286-4854|42|3|289-294

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.42, Iss.3, 2010-03, pp. : 289-294

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Abstract

The effect of non-magnetic impurities in the one-dimensional large-U Hubbard model has been studied. For a single non-magnetic scatterer, it is shown that a bound state is obtained which is due to the singular behaviour of the T-matrix. It has been argued that the bound state which yields a δ-function density of states might correspond to local moment in the system giving rise to Curie-like contribution to the susceptibility. The spatial dependence of the impurity state wave function is shown to follow an algebraic decay. Its possible relevance to some recently discovered one-dimensional antiferromagnets has been discussed.

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