Plasmon mode as a detection of the chiral anomaly in Weyl semimetals

Abstract

Weyl semimetals are one kind of three-dimensional gapless semimetal with nontrivial topology in the momentum space. The chiral anomaly in Weyl semimetals manifests as a charge imbalance between the Weyl nodes of opposite chiralities induced by parallel electric and magnetic fields. We investigate the chiral anomaly effect on the plasmon mode in both intrinsic and doped Weyl semimetals within the random phase approximation. We prove that the chiral anomaly gives rise to a different plasmon mode in intrinsic Weyl semimetals. We also find the chiral anomaly leads to some exotic properties in the plasmon dispersion in doped Weyl semimetals. Consequently, the unconventional plasmon mode acts as a signature of the chiral anomaly in Weyl semimetals, by which the spectrum of plasmon provides a proper way to detect the Lifshitz transition.

8 pages, 4 figures;References added, typos corrected,slight changes in text

References in corpus (5)

• Topological response in Weyl semimetals and the chiral anomaly
• Consequences of a condensed matter realization of Lorentz violating QED in Weyl semi-metals
• Collective modes of the massless Dirac plasma
• Chiral anomaly and optical absorption in Weyl semimetals
• Density response in Weyl metals

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