PSEUDOSPIN SU(2)-SYMMETRY BREAKING, CHARGE-DENSITY WAVES AND SUPERCONDUCTIVITY IN THE HUBBARD-MODEL

In this paper, we discuss the physical consequences of pseudospin SU(2 )-symmetry breaking in a negative-U Hubbard model at half-filling. If pseudospin symmetry is spontaneously broken while its unique subgroup U(1) remains invariant, this will lead to a charge-density-wave (CDW) ground state. Furthermore, if the U(1) symmetry is also broken, the gr ound state will have off-diagonal long-range order, signalling a super conductor. in this case, CDW and superconductivity coexist and form a supersolid. Finally, we show that CDW suppress, but do not destroy sup erconductivity.