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Electrons with alternating on‐site and correlated hopping interactions
Author(s) -
Japaridze G.,
MüllerHartmann E.
Publication year - 1994
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19945060505
Subject(s) - physics , bosonization , superconductivity , condensed matter physics , phase diagram , hubbard model , metal , electron , coupling (piping) , phase (matter) , quantum mechanics , materials science , fermion , metallurgy
The 1 D one‐band Hubbard model with different repulsive on‐site interactions on even ( U + V > 0) and odd ( U ‐ V > 0) sites, supplemented by the correlated‐hopping term ( t * > 0), describing the modification of the electron hopping by the presence of other particles on the sites, is considered as a 1 D model for CuO systems. The ground state phase diagram is studied within the framework of the bosonization technique and renormalization group analysis valid for weak coupling. Depending on the choice of model parameters, the following sequences of phase transitions with increasing bandfilling occur: 1) metal‐insulator‐metal (for t * ⩽ U /4); 2) metal‐insulator‐metal‐superconductor \documentclass{article}\pagestyle{empty}\begin{document}$ ({\rm for}U/4 < t * \le U/\sqrt 8);3) $\end{document} metal‐superconductor‐metal‐insulator‐metal‐superconductor \documentclass{article}\pagestyle{empty}\begin{document}$ ({\rm for}U/\sqrt 8 \le t * < (U + V)/\sqrt 8){\rm and}4) $\end{document} metal‐superconductor \documentclass{article}\pagestyle{empty}\begin{document}$ ({\rm for}(U + V)/\sqrt 8 \le t*) $\end{document} .