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Journal Article

Shear viscosity as a probe of nodal topology


Surówka,  Piotr
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;


Roy,  Bitan
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Moore, M., Surówka, P., Juricic, V., & Roy, B. (2020). Shear viscosity as a probe of nodal topology. Physical Review B, 101(16): 161111. doi:10.1103/PhysRevB.101.161111.

Cite as: http://hdl.handle.net/21.11116/0000-0006-8BDF-3
Electronic materials can sustain a variety of unusual, but symmetry protected, touchings of valence and conduction bands, each of which is identified by a distinct topological invariant. Well-known examples include linearly dispersing pseudorelativistic fermions in monolayer graphene, Weyl and nodal-loop semimetals, biquadratic (bicubic) band touching in bilayer (trilayer) graphene, as well as mixed dispersions in multi-Weyl systems. Here, we show that depending on the underlying band curvature, the shear viscosity in the collisionless regime displays a unique power-law scaling with frequency at low temperatures, bearing the signatures of the band topology, which are distinct from the ones when the system resides at the brink of a topological phase transition into a band insulator. Therefore, besides the density of states (governing specific heat, compressibility) and dynamic conductivity, shear viscosity can be instrumental to pin nodal topology in electronic materials.