Obtaining a Heisenberg Hamiltonian from the Hubbard model
- 1 January 1976
- journal article
- Published by American Association of Physics Teachers (AAPT) in American Journal of Physics
- Vol. 44 (1) , 44-46
- https://doi.org/10.1119/1.10537
Abstract
A pedagogically useful method of obtaining a Heisenberg spin–spin interaction from a familiar many-electron Hamiltonian by means of ordinary degenerate perturbation theory is presented.Keywords
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