Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 23: Correlated Electrons: (General) Theory
TT 23.5: Talk
Wednesday, February 27, 2008, 15:00–15:15, H 0104
Competing Instabilities in One Dimension - Functional Renormalization Group With Symmetry Breaking Terms — •Matthias Ossadnik1,2 and Carsten Honerkamp1 — 1Universität Würzburg — 2ETH Zürich
Fermionic renormalization group flows often lead to strong coupling, i.e. certain components of the interactions diverge at low energy scale and temperatures. By including appropriate types of symmetry-breaking via counterterms in the initial conditions of the flow, the divergence can however be avoided and properties of the low-temperature state can be computed. Here we show for a one-dimensional example that this approach allows us to describe competing order and quantum phase transitions between ground states with different symmetries, in qualitative agreement with bosonization analysis.