Spontaneous breaking of four-fold rotational symmetry in two-dimensional electron systems as a topological phase transition

Details Spontaneous breaking of four-fold rotational symmetry in two-dimensional electron systems as a topological phase transition Spontaneous breaking of four-fold rotational symmetry in two-dimensional electron systems as a topological phase transition

2010-02-28

arxiv.org/abs/1003.0216v2

Phys.Rev.B 82, 125111 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures; extended version, added figure

Scientific paper

10.1103/PhysRevB.82.125111

Motivated by recent observations of $C_4$ symmetry breaking in strongly correlated two-dimensional electron systems on a square lattice, we analyze this phenomenon within an extended Fermi liquid approach. It is found that the symmetry violation is triggered by a continuous topological phase transition associated with exchange of antiferromagnetic fluctuations. In contrast to predictions of mean-field theory, the structure of a part of the single-particle spectrum violating $C_4$ symmetry is found to be highly anisotropic, with a peak located in the vicinity of saddle points.

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