Topological transport in Dirac nodal-line semimetals

Rui, W.; Zhao, Y.; Schnyder, A.

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Topological transport in Dirac nodal-line semimetals

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Zhao, Y.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

Schnyder, A.
Max Planck Society;

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Rui, W., Zhao, Y., & Schnyder, A. (2018). Topological transport in Dirac nodal-line semimetals. Physical Review B, 97(16): 161113.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D36E-9

Abstract

Topological nodal-line semimetals are characterized by one-dimensional Dirac nodal rings that are protected by the combined symmetry of inversion P and time-reversal T. The stability of these Dirac rings is guaranteed by a quantized +/-pi Berry phase and their low-energy physics is described by a one-parameter family of (2+1)-dimensional quantum field theories exhibiting the parity anomaly. Here we study the Berry-phase supported topological transport of PT-invariant nodal-line semimetals. We find that small inversion breaking allows for an electric-field-induced anomalous transverse current, whose universal component originates from the parity anomaly. Due to this Hall-like current, carriers at opposite sides of the Dirac nodal ring flow to opposite surfaces when an electric field is applied. To detect the topological currents, we propose a dumbbell device, which uses surface states to filter charges based on their momenta. Suggestions for experiments and device applications are discussed.