| Autor: |
Yang, S. -X., Fotso, H., Hafermann, H., Tam, K. -M., Moreno, J., Pruschke, T., Jarrell, M. |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 84, 155106 (2011) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.84.155106 |
| Popis: |
We have designed a new multi-scale approach for Strongly Correlated Systems by combining the Dynamical Cluster Approximation (DCA) and the recently introduced dual-fermion formalism. This approach employs an exact mapping from a real lattice to a DCA cluster of linear size Lc embedded in a dual fermion lattice. Short-length-scale physics is addressed by the DCA cluster calculation, while longer-length-scale physics is addressed diagrammatically using dual fermions. The bare and dressed dual Fermionic Green functions scale as O(1/Lc) so perturbation theory on the dual lattice converges very quickly. E.g., the dual Fermion self-energy calculated with simple second order perturbation theory is of order O(1/Lc^3), with third order and three body corrections down by an additional factor of O(1/Lc^2). |
| Databáze: |
arXiv |
| Externí odkaz: |
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