Pseudomagnetic helicons

Abstract

The existence of pseudomagnetic helicons is predicted for strained Dirac and Weyl materials. The corresponding collective modes are reminiscent of the usual helicons in metals in strong magnetic fields but can exist even without a magnetic field due to a strain-induced background pseudomagnetic field. The properties of both pseudomagnetic and magnetic helicons are investigated in Weyl matter using the formalism of the consistent chiral kinetic theory. It is argued that the helicon dispersion relations are affected by the electric and chiral chemical potentials, the chiral shift, and the energy separation between the Weyl nodes. The effects of multiple pairs of Weyl nodes are also discussed. A simple setup for experimental detection of pseudomagnetic helicons is proposed.

19 pages, 6 multipanel figures; published version with new section IV on Weyl/Dirac materials with multiple pairs of Weyl nodes

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• Anomalous transport properties of Dirac and Weyl semimetals
• Landau levels, Bardeen polynomials and Fermi arcs in Weyl semimetals: the who's who of the chiral anomaly
• Tunable axial gauge fields in engineered Weyl semimetals: Semiclassical analysis and optical lattice implementations
• Acoustogalvanic effect in Dirac and Weyl semimetals
• Second-order chiral kinetic theory: Chiral magnetic and pseudomagnetic waves
• Chiral sound waves in strained Weyl semimetals
• Origin of Bardeen-Zumino current in lattice models of Weyl semimetals
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• Collective excitations in Weyl semimetals in the hydrodynamic regime
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• Chiral response in lattice models of Weyl materials
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• Pseudo-gauge Fields in Dirac and Weyl Materials
• Electric and chiral response to a pseudoelectric field in Weyl materials
• Symmetries of Weyl Superconductors with Different Pairings
• Weyl excitations via helicon-phonon mixing in conducting materials