Phononic dynamical axion in magnetic Dirac insulators
arXiv:2311.10674 · doi:10.1103/PhysRevB.109.144304
Abstract
In cosmology, the axion is a hypothetical particle that is currently considered as candidate for dark matter. In condensed matter, a counterpart of the axion (the "axion quasiparticle") has been predicted to emerge in magnetoelectric insulators with fluctuating magnetic order and in charge-ordered Weyl semimetals. To date, both the cosmological and condensed-matter axions remain experimentally elusive or unconfirmed. Here, we show theoretically that ordinary lattice vibrations can form an axion quasiparticle in Dirac insulators with broken time- and space-inversion symmetries, even in the absence of magnetic fluctuations. The physical manifestation of the phononic axion is a magnetic-field-induced phonon effective charge, which can be probed in optical spectroscopy. By replacing magnetic fluctuations with lattice vibrations, our theory widens the scope for the observability of the axion quasiparticle in condensed matter.
12 pages, 4 figures, Published version
References in corpus (12)
- Topological Field Theory of Time-Reversal Invariant Insulators
- Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
- Axion Electrodynamics in Topological Materials
- Predominance of non-adiabatic effects in zero-point renormalization of the electronic band gap
- Axion topological field theory of topological superconductors
- Phonon-induced topological transitions and crossovers in Dirac materials
- Full magnetoelectric response of Cr2O3 from first principles
- Temperature effects in the band structure of topological insulators
- Temperature-induced topological phase transitions: promoted vs. suppressed non-trivial topology
- Phonon-induced topological insulation
- Does (TaSe4)2I really harbor an axionic charge density wave?
- Magnetoresistance in quasi-one dimensional Weyl semimetal (TaSe)I