Cumulant t-Expansion for Strongly Correlated Electrons on a Lattice
| Autor: | A. K. Zhuravlev |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Hubbard model Solid-state physics General Physics and Astronomy Electron Fermion 01 natural sciences symbols.namesake Lattice (order) 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons Statistical physics 010306 general physics Hamiltonian (quantum mechanics) Ground state Cumulant |
| Zdroj: | Journal of Experimental and Theoretical Physics. 131:460-467 |
| ISSN: | 1090-6509 1063-7761 |
| DOI: | 10.1134/s1063776120090113 |
| Popis: | A systematic nonperturbative scheme for calculating the ground state energy is adapted for studying systems of strongly correlated electrons on a lattice. It includes a method for calculating the cumulants of the Hamiltonian and a method, using the t-expansion, for constructing successive approximations to the ground state energy by these cumulants. The scheme is applied to spinless fermion and Hubbard models, and a method is proposed to overcome the problems found in previous attempts to use this scheme to study the Hubbard model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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