TY  - JOUR
AU  - Hille, Cornelia
AU  - Rohe, Daniel
AU  - Honerkamp, Carsten
AU  - Andergassen, Sabine
TI  - Pseudogap opening in the two-dimensional Hubbard model: A functional renormalization group analysis
JO  - Physical review research
VL  - 2
IS  - 3
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2020-02601
SP  - 033068
PY  - 2020
AB  - Using the recently introduced multiloop extension of the functional renormalization group, we compute the frequency- and momentum-dependent self-energy of the two-dimensional Hubbard model at half filling and weak coupling. We show that, in the truncated-unity approach for the vertex, it is essential to adopt the Schwinger-Dyson form of the self-energy flow equation in order to capture the pseudogap opening. We provide an analytic understanding of the key role played by the flow scheme in correctly accounting for the impact of the antiferromagnetic fluctuations. For the resulting pseudogap, we present a detailed numerical analysis of its evolution with temperature, interaction strength, and loop order.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000604139600006
DO  - DOI:10.1103/PhysRevResearch.2.033068
UR  - https://juser.fz-juelich.de/record/878045
ER  -