Electronic Properties of Strained Double-Weyl Systems

Pavlo O. Sukhachov, Eduard V. Gorbar, Igor Shovkovy, Vladimir A. Miransky

    Research output: Contribution to journalArticlepeer-review

    8 Scopus citations

    Abstract

    The effects of strains on the low-energy electronic properties of double-Weyl phases are studied in solids and cold-atom optical lattices. The principal finding is that deformations do not couple, in general, to the low-energy effective Hamiltonian as a pseudoelectromagnetic gauge potential. The response of an optical lattice to strains is simpler, but still only one of the several strain-induced terms in the corresponding low-energy Hamiltonian can be interpreted as a gauge potential. Most interestingly, the strains can induce a nematic order parameter that splits a double-Weyl node into a pair of Weyl nodes with the unit topological charges. The effects of deformations on the motion of wavepackets in the double-Weyl optical lattice model are studied. It is found that, even in the undeformed lattices, the wavepackets with opposite topological charges can be spatially split. Strains, however, modify their velocities in a very different way and lead to a spin polarization of the wavepackets.

    Original languageEnglish (US)
    Article number1800219
    JournalAnnalen der Physik
    Volume530
    Issue number9
    DOIs
    StatePublished - Sep 2018

    Keywords

    • double-Weyl semimetals
    • electronic properties
    • optical lattices
    • strains
    • wavepackets

    ASJC Scopus subject areas

    • General Physics and Astronomy

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