3 years ago

Weyl nodal surfaces.

Sergej Moroz, Oğuz Türker

We consider three-dimensional fermionic band theories that exhibit Weyl nodal surfaces defined as two-band degeneracies that form closed surfaces in the Brillouin zone. We demonstrate that topology ensures robustness of these objects under small perturbations of a Hamiltonian. This topological robustness is illustrated in several four-band models that exhibit nodal surfaces protected by unitary or anti-unitary symmetries. Surface states and Nielsen-Ninomiya doubling of nodal surfaces are also investigated.

Publisher URL: http://arxiv.org/abs/1709.01561

DOI: arXiv:1709.01561v2

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