Current response to axial gauge fields in noncentrosymmetric magnetic Weyl semimetals

Abstract

We investigate the electric current response to axial gauge fields in noncentrosymmetric magnetic Weyl semimetals. The absence of both time-reversal and inversion symmetries allows for new types of responses. We systematically calculate the transverse, longitudinal, and Hall responses to axial gauge potentials with both linear and quadratic dispersion relations. The transverse and Hall responses are of comparable magnitude, while the longitudinal response is much smaller. Notably, with increasing frequency, the transverse and Hall response functions manifest a peak whose height is determined by the properties of Weyl fermions and is independent of the axial gauge potential. The main features of the response functions survive in the presence of disorders. As applications of our results, we propose a Hall type magnetopiezoelectric effect, where a transverse sound wave can induce an electric current whose direction is perpendicular to the directions of sound propagation and polarization. Our results also provide a mechanism to excite magnons using electric fields and could be useful for magnon spintronics.

7 pages and 4 figures

References in corpus (14)

• Berry Curvature, Triangle Anomalies, and the Chiral Magnetic Effect in Fermi Liquids
• Chiral anomaly from strain-induced gauge fields in Dirac and Weyl semimetals
• Inhomogeneous Weyl and Dirac semimetals: Transport in axial magnetic fields and Fermi arc surface states from pseudo Landau levels
• Strain induced Chiral Magnetic Effect in Weyl semimetals
• Observation of Weyl fermions in a magnetic non-centrosymmetric crystal
• Detecting Chiral Magnetic Effect by Lattice Dynamics
• Topological spiral magnetism in the Weyl semimetal SmAlSi
• Dynamical piezoelectric and magnetopiezoelectric effects in polar metals from Berry phases and orbital moments
• Longitudinal magnetoconductance and the planar Hall conductance in inhomogeneous Weyl semimetals
• Optical conductivity of an interacting Weyl liquid in the collisionless regime
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Effects of spatial dimensionality and band tilting on the longitudinal optical conductivities in Dirac bands
• The type-I antiferromagnetic Weyl semimetal InMnTi${}_2$
• Electric and chiral response to a pseudoelectric field in Weyl materials