Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Topological Semimetals - Theory (joint session TT/MA)

TT 37.9: Vortrag

Mittwoch, 3. April 2019, 11:45–12:00, H22

Hopf-link topological nodal-loop semimetals — •Feng Xiong1,2 and Yao Zhou21Institute for Theoretical solid state physics, RWTH Aachen. — 2National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China

We construct a generic two-band model which can describe topological semimetals with multiple closed nodal loops. All the existing multi-nodal-loop semimetals, including the nodal-net, nodal-chain, and Hopf-link states, can be examined within the same framework. Based on a two-nodal-loop model, the corresponding drumhead surface states for these topologically different bulk states are studied and compared with each other. The connection of our model with Hopf insulators is also discussed. Furthermore, to identify experimentally these topologically different semimetal states, especially to distinguish the Hopf-link from unlinked ones, we also investigate their Landau levels. It is found that the Hopf-link state can be characterized by the existence of a quadruply degenerate zero-energy Landau band, regardless of the direction of the magnetic field.

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