Role of three-particle vertex within dual fermion calculations
| Autor: | Patrik Gunacker, Alexey N. Rubtsov, G. Rohringer, Sergei Iskakov, Emanuel Gull, Markus Wallerberger, Karsten Held, T. Ribic |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Vertex (graph theory) Particle physics Quantum Physics Hubbard model Strongly Correlated Electrons (cond-mat.str-el) Magnitude (mathematics) Vertex function FOS: Physical sciences Fermion Parameter space 01 natural sciences 010305 fluids & plasmas Dual (category theory) Theoretical physics Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Particle 010306 general physics Quantum Physics (quant-ph) |
| DOI: | 10.48550/arxiv.1710.00648 |
| Popis: | We investigate the influence of self-energy diagrams beyond the two-particle vertex level within dual fermion theory. Specifically, we calculate the local three-particle vertex and construct from it selected dual fermion self-energy corrections to dynamical mean field theory. For the two-dimensional Hubbard model, the thus obtained self-energy corrections are small in the parameter space where dual fermion corrections based on the two-particle vertex only are small. However, in other parts of the parameter space, they are of a similar magnitude and qualitatively different from standard dual fermion theory. The high-frequency behaviour of the self-energy correction is - surprisingly - even dominated by corrections stemming from the three-particle vertex. |
| Databáze: | OpenAIRE |
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