Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Correlated Electrons: Quantum-Critical Phenomena
TT 19.3: Vortrag
Dienstag, 26. Februar 2008, 14:30–14:45, H 3010
Instability of the Quantum-Critical Point of a 2D Weakly Ferromagnetic Fermi Liquid. — •Dmitri Efremov1, Joseph Betouras2, and Andrey Chubukov3 — 1TU Dresden — 2University of St Andrews — 3University of Wisconsin
We report the study of the stability of a 2D weakly ferromagnetic fermi liquid near to the quantum critical point in the Eliashberg approach. We find that correlations associated with the Landau damping generate a universal negative, nonanalytic q3/2 contribution to the static magnetic longitudinal susceptibility χzz(q,0) and to the transverse susceptibility χ⊥(q,0). It leads towards either incommensurate ordering or first order phase transition. The instability manifests itself also in the free energy. The correlations associated with the Landau damping generate nonanalytic terms in the free energy expansion.