Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in the kagome metals AV3Sb5 ( A =K, Rb, Cs)

  title={Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in the kagome metals 
=K, Rb, Cs)},
  author={Yu-Ping Lin and Rahul M. Nandkishore},
  journal={Physical Review B},
We analyze how the real and imaginary charge density waves interplay at the Van Hove singularity on the hexagonal lattices. A phenomenological Ginzburg-Landau analysis indicates the formation of complex orders at all three momenta under a total phase condition. These complex orders break the rotation symmetry universally, since different complex phases are generally carried at the three momenta. A rich Haldane-model phase diagram of 3Q complex charge density waves is mapped out, where the… Expand

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