Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-09-20
New Journal of Physics 8, 320 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
17 pages, 8 figures. v2 corrects typos, adds references and a discussion of the literature
Scientific paper
10.1088/1367-2630/8/12/320
First-order phase transitions in many-fermion systems are not detected in the susceptibility analysis of common renormalization-group (RG) approaches. Here we introduce a counterterm technique within the functional renormalization-group (fRG) formalism which allows access to all stable and metastable configurations. It becomes possible to study symmetry-broken states which occur through first-order transitions as well as hysteresis phenomena. For continuous transitions, the standard results are reproduced. As an example, we study discrete-symmetry breaking in a mean-field model for a commensurate charge-density wave. An additional benefit of the approach is that away from the critical temperature for the breaking of discrete symmetries large interactions can be avoided at all RG scales.
Gersch Roland
Honerkamp Carsten
Reiss J.
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