2008/02/15 by J. M. P. Carmelo, Carmelo, J. M. P., Stellan Östlund +3
Mathematics · Physics and Astronomy · #Algebraic structures and combinatorial models #FOS: Physical sciences #Nonlinear Photonic Systems #Nonlinear Waves and Solitons #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.0802.2146
openalex publication_date 2008/02/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
It is found that for on-site interaction U≠ 0 the local SU(2)× SU(2) × U(1) gauge symmetry of the Hubbard model on a bipartite lattice with vanishing transfer integral t=0 can be lifted to a global [SU(2)× SU(2)× U(1)]/Z22=SO(3)× SO(3)× U(1) symmetry in the presence of the kinetic-energy hopping term of the Hamiltonian with t>0. The generator of the new found hidden independent charge global U(1) symmetry is one half the rotated-electron number of singly-occupied sites operator. It is confirmed elsewhere that our results have important physical consequences concerning the further understanding of the unusual properties of the hole-doped cuprates.