Weyl fermions induced Magnon electrodynamics in Weyl semimetal

Abstract

Weyl fermions, which are fermions with definite chiralities, can give rise to anomalous breaking of the symmetry of the physical system which they are a part of. In their (3+1)-dimensional realizations in condensed matter systems, i.e., the so-called Weyl semimetals, this anomaly gives rise to topological electromagnetic response of magnetic fluctuations, which takes the form of non-local interaction between magnetic fluctuations and electromagnetic fields. We study the physical consequences of this non-local interaction, including electric field assisted magnetization dynamics, an extra gapless magnon dispersion, and polariton behaviors that feature "sibling" bands in small magnetic fields.

8 pages, 3 figures

References in corpus (4)

• Topological Field Theory of Time-Reversal Invariant Insulators
• Topological response in Weyl semimetals and the chiral anomaly
• Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
• Topological field theory and thermal responses of interacting topological superconductors

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• Electric manipulation of domain walls in magnetic Weyl semimetals via the axial anomaly
• Spin-valve effect for spin-polarized surface states in topological semimetals
• Probing domain wall dynamics in magnetic Weyl semimetals via the non-linear anomalous Hall effect