Pseudospin SU(2) Symmetry Breaking, Charge Density Wave and Superconductivity in the Hubbard Model

Abstract

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

arXiv comment7 pages

Cited by in corpus (6)

• The Hubbard model within the equations of motion approach
• Effective SU(2) theory for the pseudogap state
• A generating functional approach to the Hubbard model
• The phase diagram of the underdoped cuprates at high magnetic field
• Disorder-induced spin-charge separation in the 1-D Hubbard model
• SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices