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Selfenergy Effect on the Magnetic Ordering Transition in the Mono‐ and Bilayer Honeycomb Hubbard Model
Author(s) -
Honerkamp Carsten
Publication year - 2017
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201700044
Subject(s) - antiferromagnetism , condensed matter physics , hubbard model , bilayer , physics , random phase approximation , fermi liquid theory , electron , lattice (music) , strongly correlated material , quantum mechanics , chemistry , biochemistry , superconductivity , membrane , acoustics
We investigate the impact of electron self‐energy corrections on potential antiferromagnetic ordering instabilities in mono‐ and bilayer graphene, modeled by a Hubbard‐type lattice model with onsite interactions among the electrons, using a self‐consistent random phase approximation (RPA). In qualitative agreement with earlier studies we find that the electronic interactions cause non‐Fermi liquid behavior at low energies. In self‐consistent RPA, the transition scales for antiferromagnetic ordering are renormalized significantly by these self‐energy effects, both for interaction‐driven and temperature‐driven cases.