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http://dx.doi.org/10.1103/PhysRevLett.116.249702 | DOI Listing |
Phys Rev Lett
June 2016
Department of Chemistry and Biochemistry, The University of Oklahoma, Norman, Oklahoma 73069, USA.
Phys Rev Lett
July 2015
Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73069, USA.
We propose a family of structures that have "Dirac loops," closed lines of Dirac nodes in momentum space, on which the density of states vanishes linearly with energy. Those lattices all possess the planar trigonal connectivity present in graphene, but are three dimensional. We show that their highly anisotropic and multiply connected Fermi surface leads to quantized Hall conductivities in three dimensions for magnetic fields with toroidal geometry.
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