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  1. 1 Acta Physica Polonica A

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  1. 1 1997

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  1. 1 Bułka B. R.

  2. 1 Robaszewska M.

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Superconductivity in Hubbard Model with Correlated Hopping

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Bułka B. R., Robaszewska M.
Acta Physica Polonica A
|
1997
|
vol. 91
|
issue 2
363-366
EN
Using the slave-boson method in its spin- and charge-rotational invariant representation we determine stability of the superconducting state in the Hubbard model with correlated hopping. In general the term with correlated hopping violates electron-hole symmetry, however, in the special case when the correlated hopping integral X is equal to the uncorrelated hopping integral t the electron-hole symmetry remains. We investigate this case and show that correlations induced by onsite Coulomb interactions U yield to the normal state with exactly single occupied sites (corresponding to |U=∞⟩). The phase diagram of the superconducting state is determined for the different electron concentration n. At the half-filled band (n=1) a direct transition from the Mott insulator to the superconducting state occurs.
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