How to define quantum mean-field solvable Hamiltonians using Lie algebras
Abstract
Necessary and sufficient conditions for quantum Hamiltonians to be exactly solvable within mean-field theories have not been formulated so far. To resolve this problem, first, we define what mean-field theory is, independently of a Hamiltonian realization in a particular set of operators. Second, using a Lie-algebraic framework we formulate a criterion for a Hamiltonian to be mean-field solvable. The criterion is applicable for both distinguishable and indistinguishable particle cases. For the electronic Hamiltonians, our approach reveals the existence of mean-field solvable Hamiltonians of higher fermionic operator powers than quadratic. Some of the mean-field solvable Hamiltonians require different sets of quasi-particle rotations for different eigenstates, which reflects a more complicated structure of such Hamiltonians.
Keywords
Cite
@article{arxiv.2008.06633,
title = {How to define quantum mean-field solvable Hamiltonians using Lie algebras},
author = {Artur F. Izmaylov and Tzu-Ching Yen},
journal= {arXiv preprint arXiv:2008.06633},
year = {2021}
}