Department News

Aug 26, 2019 - Research Highlight: Topology driven by interactions

Nodal-line semimetals are a class of materials where the Fermi surface has the form of closed loops with low energy Dirac fermions as quasiparticles. Interactions can spontaneously break symmetries and open an energy gap around those lines. When the gap has nodes around the nodal line, as in the 3D quantum anomalous Hall effect, which is topological, the nodes form Weyl points connected by Fermi arcs, as shown above. Those fermi arcs describe topologically protected surface states, with a non-universal Hall conductivity. Prof. Bruno Uchoa’s group is interested in the interplay of strong many-body interactions and novel macroscopic manifestations of quantum phenomena. 

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