Chiral anomaly in Weyl semimetals from spin current injection
arXiv:2109.05467 · doi:10.21468/SciPostPhysCore.7.1.002
Abstract
Weyl semimetals are well-known for hosting topologically protected linear band crossings, serving as the analog of the relativistic Weyl Fermions in the condensed matter context. Such analogy persists deeply, allowing the existence of the chiral anomaly under parallel electric and magnetic field in Weyl semimetals. Different from such picture, here we show that, a unique mechanism of the chiral anomaly exists in Weyl semimetals by injecting a spin current with parallel spin polarization and flow direction. The existence of such a chiral anomaly is protected by the topological feature that each Weyl cone can also be a source or drain of the spin field in the momentum space. It leads to measurable experimental signals, such as an electric charge current parallel with an applied magnetic field in the absence of the electric field, and a sharp peak at certain resonant frequency in the injection current in achiral Weyl semimetals through the circular photogalvanic effect. Our work shows that the topological implication of Weyl semimetals goes beyond the link with relativistic Weyl Fermions, and offers a promising scenario to examine the interplay between topology and spin.
References in corpus (12)
- The Chiral Magnetic Effect
- Topological response in Weyl semimetals and the chiral anomaly
- On A Proper Definition of Spin Current
- Weyl Semimetals, Fermi Arcs and Chiral Anomalies (A Short Review)
- Chiral anomaly and transport in Weyl metals
- Dichroic f-sum rule and the orbital magnetization of crystals
- Strain induced Chiral Magnetic Effect in Weyl semimetals
- Tunable Layer Circular Photogalvanic Effect in Twisted Bilayers
- Giant spin Hall angle in the Heusler alloy Weyl ferromagnet CoMnGa
- Mirror Anomaly in Dirac Semimetals
- Theory of optical spin orientation in silicon
- Recent advancements in the study of intrinsic magnetic topological insulators and magnetic Weyl semimetals