A publication with Ricardo Zarzuela, Rodrigo Jaeschke-Ubiergo, Olena Gomonay, Libor Šmejkal and Jairo Sinova on the transport theory and spin-transfer physics in -wave altermagnets has been publised in Physical Review B.
We develop a mesoscale transport theory for the charge and spin degrees of freedom of itinerant carriers in a -wave altermagnet. Our effective Lagrangian description is built on the slave-boson formulation of the microscopic − model. We obtain a spin-polarized diffusive contribution to the effective Hamiltonian, which has no counterpart in conventional antiferromagnetism and is parametrized by the spin splitting, responsible for the so-called spin-splitter effect in -wave altermagnets. We also elucidate the spin-transfer response of the itinerant fluid as well as the spin pumping into the altermagnet, which exhibit previously unidentified combinations of the charge current and spatial partial derivatives (namely, {,} and {,}). The emergent spin-transfer physics in -wave altermagnets opens up promising perspectives for the dynamics of spin textures, such as the domain-wall motion driven by transverse charge currents. Additionally, we consider the effect of elastic distortions on the aforementioned transport properties.