Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-01-09
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, Proceedings of the XXX International Conference of Theoretical Physics: Electron Correlations in nano- and macrosyste
Scientific paper
A spin-charge unifying description for the Hubbard model based on the time dependent local gauge transformations is developed. The collective variables for charge and spin are isolated in the form of the space-time fluctuating U(1) phase field and rotating spin quantization axis governed by the SU(2) symmetry, respectively. As a result interacting electrons appear as a composite objects consisting of bare fermions with attached U(1) and SU(2) gauge fields. We elaborate on the microscopic origins of the effective action with the Coulomb interaction that contain topological theta terms. Furthermore, we unravel the link between non-trivial multiply-connected topological structure of the U(2)=U(1)$\otimes$SU(2) configurational space for gauge fields and the instanton contribution to the statistical sum.
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