Self-energy effects in functional renormalization group flows of the 
two-dimensional t-t' Hubbard model away from van Hove filling

Eberlein, A.

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Self-energy effects in functional renormalization group flows of the two-dimensional t-t' Hubbard model away from van Hove filling

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Eberlein, A.
Max Planck Society;

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Eberlein, A. (2015). Self-energy effects in functional renormalization group flows of the two-dimensional t-t' Hubbard model away from van Hove filling. Physical Review B, 92(23): 235146.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C9CC-A

Abstract

We study the impact of the fermionic self-energy on one-loop functional renormalization group flows of the two-dimensional t-t' Hubbard model, with emphasis on electronic densities away from van Hove filling. In the presence of antiferromagnetic hot spots, antiferromagnetic fluctuations lead to a flattening of the Fermi surface, shift magnetic phase boundaries, and significantly enhance critical scales. We trace back this effect to the presence of a magnetic first-order transition. For some parameters, the first-order character of the latter is reduced by self-energy effects. For reliably determining phase diagrams, the fermionic self-energy should be taken into account in functional renormalization group studies if scattering between hot spots is important.