Articulo
Interaction between different kinds of quantum phase transitions
Autor
Plastino, Ángel Luis
Ferri, Gustavo L.
Plastino, Ángel Ricardo
Institución
Resumen
We employ two different Lipkin-like, exactly solvable models so as to display features of the competition between different fermion–fermion quantum interactions (at finite temperatures). One of our two interactions mimics the pairing interaction responsible for superconductivity. The other interaction is a monopole one that resembles the so-called quadrupole one, much used in nuclear physics as a residual interaction. The pairing versus monopole effects here observed afford for some interesting insights into the intricacies of the quantum many body problem, in particular with regards to so-called quantum phase transitions (strictly, level crossings). Instituto de Física La Plata