- Autor(in)
- Sponsor(in)
- Referenz
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- Seitenbereich
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0163 - 0180
- Schlagwort(e)
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<KWD>Bond-charge repulsion
Correlated hopping
Superconductivity
- Zusammenfsg.
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The 1D system of correlated electrons characterized in addition to the usual on-site (<I>U</I>) and nearest-neighbour (<I>V</I>) repulsion by a correlated-hopping term (<I>t</I>*) is considered. The ground state phase diagram is studied within the framework of the weak-coupling continuum-limit approach. At filling <I>v</I> the effective interaction originating from the correlated-hopping term which appears in the continuum-limit theory is given by <I>t</I>* cos (πv). Being repulsive for v < 1/2 and attractive for v > 1/2, this interaction leads to a characteristic band-filling dependence of the phase diagram of the system. For v ≠ 1/2, depending on the relation between the bare values of the coupling constants (<I>U, V, t</I>* cos (π v)) and, hence, on the band-filling, the system shows three different phases in the infrared limit: a Luttinger metal, a nonmagnetic metal and a singlet superconducting phase. For v = 1/2, the correlated-hopping interaction is dynamically trivial, leading only to a renormalization of the oneelectron hopping amplitude and the phase diagram of the model coincides with that of the extended Hubbard model.
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