Magnetic dynamics with Weyl fermions
arXiv:2011.07141 · doi:10.1103/PhysRevB.103.064409
Abstract
Transport of charge and valley degrees of freedom coupled to order-parameter dynamics in magnetic Weyl semimetals is studied in the framework of nonequilibrium thermodynamics. In addition to the established valley-related transport anomalies that are rooted in band-structure topology, we construct dissipative couplings between the three dynamic constituents of the system driven out of equilibrium by electromagnetic perturbations. We show how the valley degree of freedom mediates an effective coupling between the charge and magnetic sectors of the system, through a combination of the chiral anomaly, on the electric side, and the Onsager-paired valley torque and pumping, on the magnetic side. This work compliments previous studies of magnetic Weyl semimetals by a more systematic analysis of collective dissipation. We discuss several concrete examples of the valley-mediated current-driven magnetic instabilities and charge pumping, and extend the theory to the antiferromagnetic case.
arXiv comment8 pages, 1 figure
References in corpus (22)
- Spintronics: Fundamentals and applications
- Anomalous Hall effect
- Weyl and Dirac Semimetals in Three Dimensional Solids
- Antiferromagnetic spintronics
- Spin Transfer Torques
- Spin Caloritronics
- Nonlocal magnetization dynamics in ferromagnetic heterostructures
- Modification of the Landau-Lifshitz Equation in the Presence of a Spin-Polarized Current in CMR and GMR Materials
- Non-collinear Magnetoelectronics
- Current-induced magnetization dynamics in disordered itinerant ferromagnets
- Thin-Film Magnetization Dynamics on the Surface of a Topological Insulator
- Influence of a Uniform Current on Collective Magnetization Dynamics in a Ferromagnetic Metal
- Thermomagnonic spin transfer and Peltier effects in insulating magnets
- Longitudinal negative magnetoresistance and magneto-transport phenomena in conventional and topological conductors
- Magnetic textures and dynamics in magnetic Weyl semimetals
- Spin Hall phenomenology of magnetic dynamics
- Phenomenology of chiral damping in noncentrosymmetric magnets
- Spin and Orbital Magnetic Response on the Surface of a Topological Insulator
- Generalized Boundary Conditions for Spin Transfer
- Perspective: (Beyond) spin transport in insulators
- Stabilization of the skyrmion crystal phase in thin-film antiferromagnets
- Axial Current driven by Magnetization Dynamics in Weyl Semimetals