Abstrtact
The Fermi liquid approach is applied to the problem of spontaneous violation of the C 4 symmetry in strongly correlated two-dimensional electronic systems on a square lattice. The symmetry breaking is traced to the existence of a topological phase transition. This continuous transition is triggered when the Fermi line, driven by the quasiparticle interactions, reaches the van Hove saddle points, where the group velocity vanishes and the density of states becomes singular. An unconventional Fermi liquid emerges beyond the implicated quantum critical point.
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Zverev, M.V., Clark, J.W., Nussinov, Z. et al. Spontaneous breaking of four-fold rotational symmetry in two-dimensional electronic systems explained as a continuous topological transition. Jetp Lett. 91, 529–534 (2010). https://doi.org/10.1134/S0021364010100085
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DOI: https://doi.org/10.1134/S0021364010100085