| Autor: |
Zlatić, Veljko, Horvatić, Berislav, Dolički, Branimir, Grabowski, Stefan, Entel, Peter |
| Jazyk: |
angličtina |
| Rok vydání: |
2001 |
| Předmět: |
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| Popis: |
We develop an efficient method to calculate the third-order corrections to the self-energy of the hole-doped two-dimensional Hubbard model in space-time representation. Using the Dyson equation we evaluate the renormalized spectral function in various parts of the Brillouin zone and find significant modifications with respect to the second-order theory even for rather small values of the coupling constant U. The spectral function becomes unphysical for U~=W, where W is the half-width of the conduction band. Close to the Fermi surface and for U |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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