Coexisting edge states and gapless bulk in topological states of matter.

@article{Baum2015CoexistingES,
  title={Coexisting edge states and gapless bulk in topological states of matter.},
  author={Yuval Baum and Thore Posske and Ion Cosma Fulga and Bjorn Trauzettel and Ady Stern},
  journal={Physical review letters},
  year={2015},
  volume={114 13},
  pages={
          136801
        }
}
We consider two-dimensional systems in which edge states coexist with a gapless bulk. Such systems may be constructed, for example, by coupling a gapped two-dimensional state of matter that carries edge states to a gapless two-dimensional system in which the spectrum is composed of a number of Dirac cones. We find that, in the absence of disorder, the edge states could be protected even when the two systems are coupled, due to momentum and energy conservation. We distinguish between weak and… Expand

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