Spontaneous breaking of four-fold rotational symmetry in two-dimensional electronic systems explained as a continuous topological transition |
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Authors: | M V Zverev J W Clark Z Nussinov and V A Khodel |
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Institution: | 1.Russian Research Centre Kurchatov Institute,Moscow,Russia;2.McDonnell Center for the Space Science and Department of Physics,Washington University,St. Louis,USA |
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Abstract: | 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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