Effective Heisenberg Model and Exchange Interaction for Strongly Correlated SystemsWe consider the extended Hubbard model and introduce a corresponding Heisenberg-like problem written in terms of spin operators. The derived formalism is reminiscent of Anderson's idea of the effective exchange interaction and takes into account nonlocal correlation effects. The results for the exch...
Posted by Mikhail Katsnelson on 20 Jul 2018, 16:33
from Facebook