Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Correlated Electrons: (General) Theory

TT 23.16: Vortrag

Mittwoch, 27. Februar 2008, 18:15–18:30, H 0104

Self-masking of Fermi surface symmetry breaking in layered materials — •hiroyuki yamase — Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany

Recently, a new type of spontaneous symmetry breaking, the d-wave type Fermi surface deformation (dFSD), the so-called Pomeranchuk instability, was found in various two-dimensional (2D) models such as t-J, Hubbard, and extended Hubbard. Such 2D systems are often realized in layered materials, where a small interlayer coupling exists. In this contribution, employing the bilayered model with a pure forward scattering interaction driving the dFSD instability, we study the stacking of the dFSD state along the z axis. Since the dFSD is characterized by breaking of the Ising symmetry, there are two possibile stacks, (+,+) and (+,–). We find that the latter "antiferromagnetic" configuration is usually favored and thus bulk symmetry breaking is hidden.