SU (N) Heisenberg Models
The use of large N approximations to treat strongly interacting quantum systems been very extensive in the last decade. The approach originated in elementary particles theory, but has found many applications in condensed matter physics (see bibliography). Initially, the large N expansion was developed for the Kondo and Anderson models of magnetic impurities in metals. Soon thereafter it was extended to the Kondo and Anderson lattice models for mixed valence and heavy fermions phenomena in rare earth compounds. The approach was also applied to treat the strong Coulomb interactions in high T c cuprate superconductors.
Unable to display preview. Download preview PDF.